CFEngine in a day

Before we start

Schedule

Use the source

github.com/nickanderson/cfengine-training

Hi, I'm Nick

• Wife, 2 kids and a dog
• Sysadmin/Infrastructure Engineer/Doer of things
• CFEngineering for >10 years
• Find me online
  • nick@cmdln.org | nick.anderson@northern.tech
  • @cmdln_
  • cmdln.org
  • linkedin.com/in/hithisisnick
  • 9274 E588 E866 A10B 713C 9CCD 9EB3 AD42 5D1C CC11

Who are you?

• Name
• Role
• Goals for this training

What this training covers

• What is CFEngine
• High level architecture overview
• Language fundamentals (through CFEngine 3.15.0)
• Examples and Exercises
• Useful tooling and tips

Why Automation?

Every time someone logs onto a system by hand, they jeopardize everyone's understanding of the system. – Mark Burgess

What is CFEngine?

• Modern
• Secure
• Scalable
• Agile infrastructure automation tool

History

• Written by Mark Burgess
• Originally released in 1993.
• Computer Immunology (Self Healing) 1998
• CFEngine 2 (1998)
• Promise Theory (2005)
• CFEngine 3 (2008)
• Company Founded (2008)
• CFEngine 3.15 (2019)

Small

As of Feb 2020:

• Lines of code ~ 115k
• ~ 6M Package size
• Memory Utilization: ~ 80MB
  • cf-agent ~ 30MB
  • cf-serverd ~ 30MB
  • cf-execd ~10MB
  • cf-monitord ~ 10MB

Secure

A good track record.

• http://web.nvd.nist.gov/view/vuln/search

Portable

Known to run on many platforms, and interesting places.

Resilient & Autonomous

Declarative

Focus on the desired end state

Declarative vs Imperative

bundle agent main             | #!/bin/env/bash
{                             | PKG="openssh-server"
  packages:                   | rpm -q ${PKG} || yum install ${PKG} 
       "openssh-server"       | yum check-update openssh-server
         policy => "present", | if [ $? -eq 100 ]; then
         version => "latest"; |   yum upgrade openssh-server
}                             | fi 

Typical use cases

• Any local resource/state
  • Manage files, processes, commands
• Security Hardening
• Compliance
• Application Deployment/Management
• Inventory (with Enterprise)

Editions

Community (core)

• Github
• Tarballs
• Binary Packages
• Linux Package Repositories

wget -O- https://cfengine.package-repos.s3.amazonaws.com/\
  quickinstall/quick-install-cfengine-community.sh | sudo bash

Enterprise Features

Enterprise

• Vagrant Environment
• Binary Packages

wget http://cfengine.package-repos.s3.amazonaws.com/quickinstall/\
quick-install-cfengine-enterprise.sh
sudo bash ./quick-install-cfengine-enterprise.sh <hub|agent>

Client/Server Architecture

Client Server Communications

• Utilizes port 5308 (grep 5308 /etc/services)
• Encrypted (TLS)
• Public key authentication (key exchange required)
• Agents download policy from hub
• Hub downloads reports from remote agents

Agent Components

Agent Components

cf-hub

• Collects reports from remote agents
• Obeys "common control" and "hub control" bodies

cf-runagent

• Requests invocation of cf-agent on remote hosts
• Cannot invoke arbitrary commands
• Define classes to modify behavior (--define)
• Specify bundlesequence (--remote-bundles)

cf-serverd

• Listens for connections on TCP/5308
• Enforces access control and authentication
• Serves files
• Serves cf-runagent requests
• Serves reports to cf-hub
• Runs on both server and clients
• Evaluates "common" and "server" bundles
• Obeys body "server control"

cf-key

• Show recent connections
• Manage trust of public keys
• Generates key pairs
• Installs Enterprise License

cf-promises

• Checks Syntax
• Dump Syntax (cf-promises --syntax-description
• Tag Policy Releases (cf-promises --tag-release)
• Show first order Variables and Classes (cf-promises --show-vars --show-classes

cf-monitord

• Measures things
• Defines mon.* variables
• Defines classes based on anomaly detection
• Evaluates "common" and "monitor" bundles
• Obeys "common control" and "monitor control" bodies

cf-execd

• Executes cf-agent periodically
• Controls period and splay time
• Collects, stores, and sends output
• Evaluates "common" bundles
• Obeys "executor control" body

cf-agent

• The catalyst or instigator of change
• Evaluates "agent" and "common" bundles
• Obeys "common control" and "agent control" bodies.
• By default runs $(sys.default_policy_path)
  • Privileged : /var/cfengine/inputs/promises.cf
  • Unprivileged: ~/.cfagent/inputs/promises.cf
• Actuates body common control bundlesequence if defined, or bundle __main__ or bundle main

cf-secret

• Encrypts and decrypts files using CFEngine keys

Pop Quiz

• What needs to happen before remote agents can get policy from the hub?

• Where is the policy that the agent runs by default?

• What port needs to be open bidirectionally?

• How does information from client hosts get into the Enterprise Hub Database?

• What is the meaning of life, the universe and everything?

MPF & stdlib

The default "Masterfiles"

Overview

• promises.cf
• update.cf
• standalone_self_upgrade.cf
• lib/*
• cfe_internal/*
• controls/*
• inventory/*
• templates/*

User Entries

• def.json (Augments)
• services/*.cf
• services/main.cf
• services/autorun/*.cf
• CUSTOM_DIRECTORY/*.cf

Unattended Policy Execution Overview

Pop Quiz

• What is the MPF?

• Where do you configure most MPF tunables?

• When is the MPF typically upgraded?

Promise Theory

Promises

Basic Concepts

Language

Promise outcomes/results

• kept
• repaired
• not_kept
  • failed
  • denied
  • timeout

Note: Compound promises can have multiple outcomes at the same time (not_kept & kept & repaired).

files:
  "/mnt/volume/file.txt"
    create => "true",
    perms => m( 777 ),
    edit_line => lines_present( "Hello World $(sys.date)" ),
    edit_defaults => empty;

Promise types

access, build_xpath, classes, commands, databases, defaults, delete_attribute, delete_lines, delete_text, delete_tree, field_edits, files, guest_environments, insert_lines, insert_text, insert_tree, measurements, meta, methods, packages, processes, replace_patterns, reports, roles, services, set_attribute, set_text, storage, users, vars

Syntax Structure

bundle type name
{
  promise_type:

    context::

      "promiser" -> { "optional", "stakeholder" }
        attribute_1 => value_1,
        attribute_2 => value_2,
        meta => { "tag1", "tag2", "tag3=something" },
        comment => "Why important";
}

body attribute_N name(optional)
{
    context::
      attribute_N_1 => "value";
      attribute_N_2 => { "value" };
}

Bundles

• Collection of logically related promises
• Can take parameters
• Maintain some variable state
• Can return values
• Are not functions

Example bundles hold some state

bundle agent main
{
  methods:
      "" usebundle => set_item_in_bag( "hammer", "slightly damaged");
      "" usebundle => set_item_in_bag( "pickaxe", "perfect");
      "" usebundle => set_item_in_bag( "flask", "half full");
      "" usebundle => report_bag_contents;
  reports:
    "$(with)" with => join( ", ", getindices( "set_item_in_bag.array" ) );
}

R: You look in the bag and see ....
R: A slightly damaged hammer
R: A perfect pickaxe
R: A half full array[flask]
R: A half full flask
R: flask

Bundles for logical abstraction

For example, a bundle to configure Apache might:

• install the apache2 package
• edit the configuration file
• copy the web server content
• configure file-system permissions
• ensure the httpd process is running
• restart the httpd process when necessary

Bundle types

cf-promises --syntax-description json | jq '.bundleTypes | keys[]'

agent

evaluated by cf-agent

common

evaluated by all components

edit_line

evaluated by cf-agent for files type promises

edit_xml

evaluated by cf-agent for files type promises

monitor

evaluated by cf-monitord

server

evaluated by cf-serverd

Bundlesequence

• main is the default
• __main__ is treated as main if in $(sys.policy_entry_filename)

bundle agent hello_world 
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods: "hello_world";
}

Bodies

• Collection of attributes
• Have a type ( e.g. classes, perms, copy_from )
• Can take parameters
• Can be inherited (3.8+)
• Can be defaulted for a given promise type (3.9+)

There are 41 body types as of 3.15.0

cf-promises --syntax-description json | jq '.bodyTypes | keys |join(", ") '

acl, action, agent, changes, classes, common, contain, copy_from, database_server, delete, delete_select, depth_search, edit_defaults, edit_field, environment_interface, environment_resources, executor, file, file_select, hub, insert_select, link_from, location, match_value, monitor, mount, package_method, package_module, password, perms, printfile, process_count, process_select, rename, replace_with, report_data_select, runagent, select_region, server, service_method, volume

Special bodies that control agent behavior

• body common control
• body file control
• body agent control
• body server control
• body executor control
• body hub control

Default bodies

bundle agent main
{
  files:
    "/tmp/show_default_action"
      create => "true";

    "/tmp/show_explicit_action"
      create => "true",
      action => fix;
}

body action fix
{
  action_policy => "fix";
}

body file control
{
  namespace => "bodydefault";
}
body action files_action
{
  action_policy => "warn";
}

warning: Warning promised, need to create file '/tmp/show_default_action'
   info: Created file '/tmp/show_explicit_action', mode 0600

Normal Order

• The order in which CFEngine executes promise types
  • Classes then Vars are evaluated during policy parsing and pre-eval
  • Promises are evaluated from top to bottom respecting class restrictions
  • Bundles listed in the bundlesequence or activated via methods are given 3 pass evaluation

Example:

bundle agent illustrating_normal_order
{
   vars:
     "color1" string => "red";

   reports:
     "$(color1)+$(color2) = Purple";

   vars:
     "color2" string => "blue";
}

# cf-agent --bundlesequence illustrating_normal_order --no-lock --log-level info --file illustrating_normal_oder.cf
    info: Using command line specified bundlesequence
R: red+blue = Purple

bundle agent illustrating_normal_order
{
   vars:
     "color1" string => "red";
     "color2" string => "blue";

   reports:
     "$(color1)+$(color2) = Purple";
}

# cf-agent --bundlesequence illustrating_normal_order --no-lock --log-level info --file illustrating_normal_oder2.cf
    info: Using command line specified bundlesequence
R: red+blue = Purple

Augments (def.json)

• Very early definition
• Loaded if def.json is found next to $(sys.policy_entry_filename)
• Classes based on system discovery (platform/networks/arch)
• Variables defined in def bundle scope

Example augments

{
  "classes": {
      "by_regular_expression": [ "ubuntu_\\d+" ],
      "by_class_expression": [ "(Afternoon|Evening).(Monday|Wednesday|Friday)::" ],
  },
  "vars": {
      "myvar1": "defined from augments",
      "myvar2": "defined from augments"
    }
}

Example policy using augments

bundle agent main
{
  reports:
    "I defined '$(const.dollar)(def.myvar1)' as '$(def.myvar1)'";

    by_regular_expression::
      "Define classes from augments based on a regular expression";

    by_class_expression::
      "Define classes from augments based on CFEngine class expressions";

}

Example output

cf-agent --no-lock --file ./examples/augments/augments.cf

R: I defined '$(def.myvar1)' as 'defined from augments'
R: Define classes from augments based on a regular expression
R: Define classes from augments based on CFEngine class expressions

Policy always wins!

bundle common def
{
  vars:
    "myvar1" string => "Defined in policy";
    "myvar2"
      string => "Defined in policy",
      if => not( isvariable( myvar2 ) );
} 
bundle agent main
{
  reports:
    "I defined '$(const.dollar)(def.myvar1)' as '$(def.myvar1)'";
    "I defined '$(const.dollar)(def.myvar2)' as '$(def.myvar2)'";

    by_regular_expression::
      "Define classes from augments based on a regular expression";

    by_class_expression::
      "Define classes from augments based on CFEngine class expressions";
}

Example output

cf-agent --no-lock --file ./examples/augments/augments-policy-wins.cf

R: I defined '$(def.myvar1)' as 'Defined in policy'
R: I defined '$(def.myvar2)' as 'defined from augments'
R: Define classes from augments based on a regular expression
R: Define classes from augments based on CFEngine class expressions

Multiple augments

Merge more augments on top.

{
  "vars": {
      "myvar1": "defined from augments for all",
      "myvar2": "defined from augments for all"
    },
  "augments": [ "$(sys.policy_entry_dirname)/$(sys.os).json" ]
}

{
  "vars": {
      "myvar2": "override for linux hosts"
    }
}

Multiple augments: Example policy

bundle agent main
{
  reports:
    "'$(const.dollar)(def.myvar1)' is '$(def.myvar1)'";
    "'$(const.dollar)(def.myvar2)' is '$(def.myvar2)'";
}

cf-agent --no-lock --file ./examples/augments-multiple/promises.cf

R: '$(def.myvar1)' is 'defined from augments for all'
R: '$(def.myvar2)' is 'override for linux hosts'

Macros

• Conditional parsing based on version and features
• Use for supporting future syntax, speed optimizations

Version based

• minimum_version
• maximum_version
• at_version
• between_versions
• before_version
• after_version

Feature based

• Feature Macro documentation

You can conditionally parse policy based on compiled in features using this macro.

bundle agent main
{
@if feature(yaml)
# the yaml library may not be compiled in
  vars: "container" data => parseyaml('
- array1
- array2
- key: 1
- key: 2');
@endif

  reports:
    "$(with)" with => string_mustache('{{%-top-}}', container );
}

Else

• Must come after an @if macro

bundle agent extractor
{
@if minimum_version(3.16)
  # Implementation for 3.16+
  vars:
    "container"
      data => classfiltercsv(...);
@else
  # Implementation for versions before 3.16
  vars:
    "container"
      data => readcsv(...);
@endif
}

Functions

There are 181 functions as of 3.17.0

accessedbefore, accumulated, ago, and, basename, bundlesmatching, bundlestate, callstack_callers, callstack_promisers, canonify, canonifyuniquely, cf_version_after, cf_version_at, cf_version_before, cf_version_between, cf_version_maximum, cf_version_minimum, changedbefore, classesmatching, classfiltercsv, classify, classmatch, concat, countclassesmatching, countlinesmatching, data_expand, data_readstringarray, data_readstringarrayidx

data_regextract, data_sysctlvalues, datastate, difference, dirname, diskfree, escape, eval, every, execresult, execresult_as_data, expandrange, file_hash, fileexists, filesexist, filesize, filestat, filter, findfiles, findprocesses, format, getclassmetatags, getenv, getfields, getgid, getindices, getuid, getuserinfo, getusers, getvalues, getvariablemetatags, grep, groupexists, hash, hash_to_int, hashmatch, host2ip, hostinnetgroup, hostrange

hostsseen, hostswithclass, hubknowledge, ifelse, intersection, ip2host, iprange, irange, isdir, isexecutable, isgreaterthan, isipinsubnet, islessthan, islink, isnewerthan, isplain, isvariable join, lastnode, laterthan, ldaparray, ldaplist, ldapvalue, length, lsdir, makerule, maparray, mapdata, maplist, max, mean, mergedata, min, network_connections, none, not, now, nth, on, or, packagesmatching, packageupdatesmatching, parseintarray, parsejson

parserealarray, parsestringarray, parsestringarrayidx, parseyaml, peerleader, peerleaders, peers, processexists, product, randomint, read_module_protocol, readcsv, readdata, readenvfile, readfile, readintarray, readintlist, readjson, readrealarray, readreallist, readstringarray, readstringarrayidx, readstringlist, readtcp, readyaml, regarray, regcmp, regex_replace, regextract, registryvalue, regldap, regline, reglist, remoteclassesmatching

remotescalar, returnszero, reverse, rrange, selectservers, shuffle, some, sort, splayclass, splitstring, storejson, strcmp, strftime, string_downcase, string_head, string_length, string_mustache, string_replace, string_reverse, string_split, string_tail, string_trim, string_upcase, sublist, sum, sysctlvalue, translatepath, unique, url_get, usemodule, userexists, validdata, validjson, variablesmatching, variablesmatching_as_data, variance

Pop Quiz

• What is a bundle?

• What is the fundamental underlying philosophy that CFEngine is based on?

• When is the next break?

• Which component collects reports from remote agents?

• What types of bundles are there?

• In what order are promises within a bundle processed?

• How can you use new language features when you still have some old agents?

Making Decisions: Context Classes and Expressions

Classes

• Restrict promises based on context
• Usable in bundles and bodies
• Used for making decisions
• Can be combined with expressions

What classes are defined?

cf-promises --show-classes

cf-agent --show-evaluated-classes

vars:
  "defined" slist => classesmatching( ".*" );

Example

cf-promises --show-classes | tail -n+2 | awk -vORS=", " '{print $1}'

127_0_0_1, 172_17_0_1, 192_168_122_1, 192_168_42_189, 4_cpus, 64_bit, Afternoon, Day23, February, GMT_Day23, GMT_Evening, GMT_February, GMT_Hr18, GMT_Hr18_Q3, GMT_Lcycle_1, GMT_Min30_35, GMT_Min34, GMT_Q3, GMT_Sunday, GMT_Yr2020, Hr12, Hr12_Q3, Lcycle_1, Min30_35, Min34, PK_SHA_43c979e264924d0b4a2d3b568d71ab8c768ef63487670f2c51cd85e8cec63834, Q3, Sunday, Yr2020, any, cfengine, cfengine_3, cfengine_3_15, cfengine_3_15_0, common, compiled_on_linux_gnu, debian, debian_buster, enterprise, enterprise_3, enterprise_3_15, enterprise_3_15_0, enterprise_edition,

fe80__5ee0_c5ff_fe9f_f38f, feature, feature_curl, feature_def, feature_def_json, feature_def_json_preparse, feature_tls, feature_tls_1, feature_tls_1_0, feature_tls_1_1, feature_tls_1_2, feature_tls_1_3, feature_xml, feature_yaml, ipv4_127, ipv4_127_0, ipv4_127_0_0, ipv4_127_0_0_1, ipv4_172, ipv4_172_17, ipv4_172_17_0, ipv4_172_17_0_1, ipv4_192, ipv4_192_168, ipv4_192_168_122, ipv4_192_168_122_1, ipv4_192_168_42, ipv4_192_168_42_189, ipv4_gw_192_168_42_1, ipv6_fe80__5ee0_c5ff_fe9f_f38f, linux, linux_5_0_0_38_lowlatency, linux_x86_64, linux_x86_64_5_0_0_38_lowlatency, linux_x86_64_5_0_0_38_lowlatency__41_Ubuntu_SMP_PREEMPT_Tue_Dec_3_01_06_41_UTC_2019,

mac_02_42_fb_b7_c0_59, mac_52_54_00_6b_62_06, mac_5c_e0_c5_9f_f3_8f, my_other_example, net_iface_docker0, net_iface_lo, net_iface_virbr0, net_iface_wlan0, nickanderson_thinkpad_w550s, nova, nova_3, nova_3_15, nova_3_15_0, nova_edition, systemd, test_class_29665402e2b4331f10b8d767b512cd916eeb5db9, test_class_29665402e2b4331f10b8d767b512cd916eeb5db9_2, ubuntu, ubuntu_19, ubuntu_19_04, x86_64,

Class expressions

• It's more common to use . than & to express AND

Example illustrating class expressions

bundle agent main
{
  files:
    linux.(Sunday|Saturday)::
      "/etc/nologin" -> { "Human Resources" }
        create => "true",
        comment => "Disallow non-root logins on the weekend.
                    We believe in work-life balance, and
                    encourage it.";

    linux.!(Sunday|Saturday)::
      "/etc/nologin" -> { "Business Operations" }
        delete => tidy,
        comment => "People need to be able to log in for them
                  to do their work during the week";
}

Class types

• Hard Classes
• Soft Classes

Hard classes

• Defined by agent
• Not configurable
• Always available
• Discovered each run
• Cannot be undefined

redhat, Thursday, linux

Soft classes

• Defined by policy
• Based on anything
• Available after definition
• Can persist for period of time
• Can be namespace or bundle scoped
• Can be undefined only as the result of a promise

Valid Class names

• Allowed characters include [a-zA-Z0-9_]
• Canonify a string to produce a valid class name
  • Converts invalid characters to _.
• Automatically canonified when defined

Note: Classes are NOT automatically canonified when checked.

Example of automatic canonification

bundle agent main
{
  vars:
    "my_class_name" string => "Invalid-Class/Name!";
    "c_my_class_name" string => canonify( "$(my_class_name)" );

  classes:
    "$(my_class_name)" expression => "any";

  reports:

    "'$(my_class_name)' is **NOT** a class that is defined"
      unless => "$(my_class_name)";

    "'$(c_my_class_name)' **IS** a defined class"
      if => canonify( $(my_class_name) );
}

R: 'Invalid-Class/Name!' is **NOT** a class that is defined
R: 'Invalid_Class_Name_' **IS** a defined class

Class scope

• Namespace scoped classes are accessible from any bundle.
• Persist until end of agent run or explicitly undefined.
• Bundle scoped classes are only accessible from within the bundle the class was defined, or bundles actuated via methods where inheritance is specified
• All hard classes are namespace scoped

Class scope rules

• classes bodies default to namespace scope

Pro Tip: Use bundle scoped classes whenever possible.

Define custom classes by expression

bundle agent main
{
  classes:
    "weekend" or => { "Saturday", "Sunday" };
    "weekday" not => "weekend";

    "business_hours"
      expression => "weekday.(Hr9|Hr10|Hr11|Hr13|Hr14|Hr15|Hr16|Hr17)",
      comment => "Weekdays from 9-5 excluding the lunch hour.";

    "webserver"
      expression => regcmp( "www.*", $(sys.fqhost) ),
      comment => "Identify webservers based on their name";

    "north_america"
      expression => iprange( "10.1.0.0/16" );
}

Define custom classes by promise outcome

bundle agent main
{
  vars:
    "config[PermitRootLogin]" string => "no";

  files:
    "/etc/ssh/sshd_config"
      edit_line => set_line_based("$(this.bundle).config", # Config MAP
                                  " ",        # Separator
                                  "\s+",      # Separator regex
                                  ".*",       # Keys to consider
                                  "\s*#\s*"), # Lines to ignore
      classes => scoped_classes_generic("bundle", "sshd_config");

  services:
    sshd_config_repaired::
      "sshd"
        service_policy => "restart",
        comment => "For sshd to pick up changed config it must be restarted."
}

Example - traditional class expressions

bundle agent main
{
  reports:
      "Hello World!";
    linux.!(Saturday|Sunday)::
      "This is a linux host.";
      "Today is not Saturday or Sunday.";
}

R: Hello World!
R: This is a linux host.
R: Today is not Saturday or Sunday.

Example - restrict individual promises with if and unless

bundle agent main
{
  vars:
    "platforms" slist => { "linux", "windows" };

  reports:
    "I am a $(platforms) host"
      if => "$(platforms)";
      # ifvarclass => "$(platforms)";

    "I was made by Microsoft"
      unless => "!windows";
}

R: I am a linux host

Example - variable class expressions

bundle agent main
{
  vars:
    "platforms" slist => { "linux", "windows" };

  reports:
    !(Saturday|Sunday)::
      "It's a weekday and I am a $(platforms) host!"
        if => "$(platforms)";

    "$(platforms)"::
      "I am a $(platforms) host and it's a weekday!"
        if => "!(Saturday|Sunday)";
}

R: It's a weekday and I am a linux host!
R: I am a linux host and it's a weekday!

Functions that return "context"

cf-promises --syntax-description json | jq '.functions | \
   with_entries( select(.value.returnType == "context") ) | \
   keys | join( ", ")'

accessedbefore, changedbefore, classify, classmatch, every, fileexists, filesexist, groupexists, hashmatch, hostinnetgroup, hostrange, iprange, isdir, isexecutable, isgreaterthan, isipinsubnet, islessthan, islink, isnewerthan, isplain, isvariable, laterthan, ldaparray, none, processexists, read_module_protocol, regarray, regcmp, regextract, regldap, regline, reglist, remoteclassesmatching, returnszero, some, splayclass, strcmp, usemodule, userexists

Pop Quiz

• What types of classes are there?

• What is the difference?

• What are valid class characters?

• What is the default scope for classes defined as the result of a promise outcome using a classes body?

• What component serves policy files, which hosts can be a policy server?

Variables & Data Types

Variable Scoping

• All variables are globally accessible
• $(variable), @(list or data container)
• Use fully qualified variable names when accessing variables in other bundles.
  • $(bundle.variable), @(bundle.list)
  • $(namespace:bundle.variable), @(namespace:bundle.list)

Datatypes

• string, int, real
• slist, ilist, rlist
• classic "array"
• data

Example - strings

bundle agent main
{
  vars:
    "string1" string => "one";
    "string2" string => "strings
can be multi-line";
    "string3" string => "with \"quotes\"";
    "string4" string => 'or "quotes"';
    "string5" string => `with 'single' and "double" quotes`;

  reports:
    "string1 = '$(string1)'";
    "string2 = '$(string2)'";
    "string3 = '$(string3)'";
    "string4 = '$(string4)'";
    "string5 = '$(string5)'";
}

R: string1 = 'one'
R: string2 = 'strings
can be multi-line'
R: string3 = 'with "quotes"'
R: string4 = 'or "quotes"'
R: string5 = 'with 'single' and "double" quotes'

Example - numbers

bundle agent main
{
  vars:
    "var1" int => "1";
    "var2" int => "10K";
    "var3" real => "1.2";
    "var4" real => "10e-5";
    "var5" int => "inf";

  reports:
    "var1 = '$(var1)'";
    "var2 = '$(var2)'";
    "var3 = '$(var3)'";
    "var4 = '$(var4)'";
    "inf = '$(var5)'";
}

R: var1 = '1'
R: var2 = '10240'
R: var3 = '1.200000'
R: var4 = '0.000100'
R: inf = '999999999'

Example - lists

bundle agent main
{
  vars:
    "var1" ilist => { 1, 2, "3", "4" };
    "var2" rlist => { "1.2", "2.0", "3.3" };
    "var3" slist => { "one", "two", three,
                      @(var1), @(var2),
                    };
    "var4" real => sum( var2 );

  reports:
    "var1 = '$(var1)'";
    "var2 = '$(var2)'";
    "var3 = '$(var3)'";
    "var4 = '$(var4)'";
}

R: var1 = '1'
R: var1 = '2'
R: var1 = '3'
R: var1 = '4'
R: var2 = '1.2'
R: var2 = '2.0'
R: var2 = '3.3'
R: var3 = 'one'
R: var3 = 'two'
R: var3 = 'three'
R: var3 = '1'
R: var3 = '2'
R: var3 = '3'
R: var3 = '4'
R: var3 = '1.2'
R: var3 = '2.0'
R: var3 = '3.3'
R: var4 = '6.500000'

Example - list iteration (loops)

bundle agent main
{
  vars:
    "numbers" slist => { "1", "2", "3" };
    "colors" slist => { "red", "green", "blue" };

  reports:
    "$(numbers)";
    "$(colors)";
    "$(numbers) with $(colors)";
    "$(colors) with $(numbers)";
}

R: 1
R: 2
R: 3
R: red
R: green
R: blue
R: 1 with red
R: 1 with green
R: 1 with blue
R: 2 with red
R: 2 with green
R: 2 with blue
R: 3 with red
R: 3 with green
R: 3 with blue
R: red with 1
R: red with 2
R: red with 3
R: green with 1
R: green with 2
R: green with 3
R: blue with 1
R: blue with 2
R: blue with 3

Example - "Classic" Arrays

bundle agent main
{
  vars:
    "file[motd]"  string => "/etc/motd";
    "file[fstab]" string => "/etc/fstab";

    "file_idx" slist => getindices( file );
    "files" slist => getvalues( file );

  reports:
   "The key '$(file_idx)' has the value '$(file[$(file_idx)])'";
   "file: '$(files)'";
}

R: The key 'motd' has the value '/etc/motd'
R: The key 'fstab' has the value '/etc/fstab'
R: file: '/etc/motd'
R: file: '/etc/fstab'

Example - data containers

bundle agent main
{
  vars:
    "server" string => "mirror.int.cfengine.com";
    "repos"
      data => '{
                "rhel6_updates": {
                  "id": { "value":"RHEL6_UPDATES" },
                  "name": { "value": "RHEL 6.x Updates" },
                  "baseurl": { "value": "https://$(server)/RHEL6/updates" }
                }
              }';

    "idx" slist => getindices( repos );

  reports:
    "URL = '$(repos[$(idx)][baseurl][value])'";
}

R: URL = 'https://mirror.int.cfengine.com/RHEL6/updates'

Differences between "Classic Arrays" and "Data containers"

bundle agent main
{
  vars:
      "ClassicArray[key]" string => "value";
      "ClassicArray[deep]" slist => { "list" };
      "DataContainer"
        data => '{ "key": "value", "deep": [ "list" ] }';

  reports:
      "ClassicArray:$(with)"
        with => string_mustache( "{{%-top-}}", ClassicArray);
      "DataContainer:$(with)"
        with => string_mustache( "{{%-top-}}", DataContainer);
}

R: ClassicArray:{
  "deep": [
    "list"
  ],
  "key": "value"
}
R: DataContainer:{
  "deep": [
    "list"
  ],
  "key": "value"
}

Pop Quiz

• Which component makes changes to your system?

• Which component schedules agent runs?

• What symbol terminates a promise?

• What is your quest?

• What are promise comments used for?

• What types of variables are available?

• How are decisions made?

Policy Examples

Enable services_autorun

[root@hub masterfiles]# cat > def.json <<EOF
{
  "vars": {
            "mpf_access_rules_collect_calls_admit_ips": [ "0.0.0.0/0" ],
            "control_server_call_collect_interval": "1",
            "control_hub_exclude_hosts": [ "0.0.0.0/0" ]
  },
  "classes": {
               "mpf_augments_control_enabled": [ "any::" ],
               "client_initiated_reporting_enabled": [ "any::" ],
               "cfengine_internal_purge_policies": [ "any::" ],
               "services_autorun": [ "any::" ]
    }
}
EOF

Create a file

examples/00-20-example-create_file.cf

bundle agent nologin
{

  meta:
      "tags" slist => { "autorun" };
  files:
      "/tmp/nologin"
        create => "true",
        classes => results("bundle", "my_file");

  reports:
    my_file_repaired::
      "File repaired";

    any:: 
      "File Exists"
        if => fileexists("/tmp/nologin");
}
bundle agent __main__{methods:"nologin";}

R: File repaired
R: File Exists

Update file

examples/00-20-example-update_file.cf

bundle agent heartbeat
{
  files:
    "$(sys.statedir)/$(this.bundle)" -> { "Monitoring" }
      create  => "true",
      touch   => "true",
      classes => results("bundle", "heartbeat"),
      handle  => "cf_agent_heartbeat_thump",
      comment => "This policy simply updates the timestamp
                  of the file so an external monitoring
                  system can validate the system is working.";

  reports:
    DEBUG|DEBUG_cf_agent_heartbeat::

      "DEBUG $(this.bundle): Heartbeat"
        if => "heartbeat_repaired";

      "DEBUG $(this.bundle): Flatline"
        unless => "heartbeat_repaired";
}
  bundle agent __main__{methods:"heartbeat";}

R: DEBUG main: Heartbeat

Make sure a package is installed and service running

examples/00-20-example-package_and_service.cf

bundle agent example_package_and_service
{
  meta:
    !policy_server::
      "tags" slist => { "autorun" };

  vars:
    centos|redhat::
      "_package" string => "httpd";
      "_service" string => "httpd";

    ubuntu|debian::
      "_package" string => "apache2";
      "_service" string => "apache2";
  # ...

Competing implementations of packages promises

• methods (legacy) vs modules (modern)

packages:
  "apache2"
    package_policy => "add",
    comment => "I use the method based implementation";

  "apache2"
    policy => "present",
    comment => "I use the module based implementation";

Classify role based on hostname

examples/00-20-example-classes-role_by_hostname.cf

bundle common classes_role_by_hostname
{
  classes:
    "env_prod"
      meta => { "inventory", "attribute_name=Role Classes" },
      or => {
              regcmp( "hub", $(sys.uqhost) ),
              regcmp( "^prd.*", $(sys.uqhost) ),
            };

    "webserver"
      expression => "host001",
      meta => { "inventory", "attribute_name=Role Classes" };

    "webserver"
      expression => regcmp( "^www.*", $(sys.fqhost) ),
      meta => { "inventory", "attribute_name=Role Classes" };
}
bundle agent __main__{methods:"classes_role_by_hostname";}

Classify geographic location by network

examples/00-20-example-classes-geographic_location_by_network

bundle common classify_geo_location_by_network
{
  meta:
    "tags" slist => { "autorun" };

  vars:
    "nadc01_subnets"
      slist => { "172.16.25.0/25", "172.17.0.0/16",
                 "192.168.33.2/32",
               };

    "nadc02_subnets"
      slist => { "172.17.5.0/25", "172.42.0.0/16",
                 "192.168.33.3/32",
               };

    "sadc01_subnets"
      slist => { "172.19.4.0/23", "192.168.33.4-5" };

    "continent"
      string => ifelse("north_america", "North America",
                       "south_america", "South America",
                       "Unknown"),
      meta => { "inventory", "attribute_name=Continent" };

Manage key value entries in a config file

examples/00-20-example-key_value_config.cf

bundle agent manage_ssh
{
  meta:
    "tags" slist => { "autorun" };

  methods:
    "SSH Config Data"
      usebundle => ssh_config;

    "Manage SSH Config"
      usebundle => ssh_config_manage_kv("ssh_config.data");
}

[root@hub masterfiles]# cf-agent -KID DEBUG_ssh_config,DEBUG_ssh_config_manage_kv
    info: Installing cfe_internal_non_existing_package...
R: DEBUG ssh_config: PermitRootLogin = 'no'
R: DEBUG ssh_config: Protocol = '2'
R: DEBUG ssh_config: Port = '22'
    info: Edit file '/etc/ssh/sshd_config'
R: DEBUG ssh_config_manage_kv: Reparied configuration
    info: Executing 'no timeout' ... '/sbin/service sshd restart'
  notice: Q: "...in/service sshd": Stopping sshd:          [  OK  ]
Q: "...in/service sshd": Starting sshd:                    [  OK  ]
    info: Last 2 quoted lines were generated by promiser '/sbin/service sshd restart'
    info: Completed execution of '/sbin/service sshd restart'
R: DEBUG ssh_config_manage_kv: Configuration Valid
R: DEBUG ssh_config_manage_kv: Restarted sshd after config change

Templating a file with mustache

examples/00-20-example-mustache_template_inline_using_datastate.cf

bundle agent motd
{
  meta:
    "tags" slist => { "autorun" };

  vars:
    "owner" string => "Bruce Wayne";

  files:
    "/etc/motd"
      template_method => "inline_mustache",
      edit_template_string => 'Welcome to {{{vars.sys.fqhost}}}!

For support issues please contact {{{vars.motd.owner}}}.';
}
bundle agent __main__{methods:"motd";}

Mustache extensions

• -top- data handed to the templating engine
• @ Currently iterated key
• % Multi-line JSON representation of data
• $ Serialized JSON representation of data

examples/02-01-mustache-extensions.cf

bundle agent example_mustache_extensions
{
  vars: "d" data => '{ "key": "value", "list": ["one", "two"]}';
  reports:
    "Multiline: $(with)" with => string_mustache( "{{%-top-}}", d);
    "Serial: $(with)" with => string_mustache( "{{$-top-}}", d);
    "Keys: $(with)" with => string_mustache( "{{#-top-}}{{{@}}}, {{/top}}", d);
}
bundle agent __main__{methods:"example_mustache_extensions";}

R: Multiline: {
  "key": "value",
  "list": [
    "one",
    "two"
  ]
}
R: Serial: {"key":"value","list":["one","two"]}
R: Keys: key, list, 

examples/02-01-mustache-extensions-yaml.cf

bundle agent example_mustache_extensions_yaml
{
  vars: "d" data => '---
key: value
list:
  - one
  - two';
  reports:
    "Multiline: $(with)" with => string_mustache( "{{%-top-}}", d);
    "Serial: $(with)" with => string_mustache( "{{$-top-}}", d);
    "Keys: $(with)" with => string_mustache( "{{#-top-}}{{{@}}}, {{/top}}", d);
}
bundle agent __main__{methods:"example_mustache_extensions_yaml";}

R: Multiline: {
  "key": "value",
  "list": [
    "one",
    "two"
  ]
}
R: Serial: {"key":"value","list":["one","two"]}
R: Keys: key, list, 

Inventory SSH Host Keys

examples/inventory-ssh-host-keys.cf

bundle agent example_inventory_ssh_host_keys
{
  vars:
      "keys" slist => lsdir("/etc/ssh", "ssh_host_\w+_key", "false");
      "$(keys)"
        data => data_regextract("ssh_host_(?<type>\w+)_key", $(keys) );

      "type[$(keys)]"
        string => "$($(keys)[type])",
        meta => { "inventory", "attribute_name=SSH HostKey Type" };

      # Warning ssh-keygen output may vary across versions
      "fingerprint[$(keys)]"
        string => nth(
                       string_split(
                                     execresult("/usr/bin/ssh-keygen -l -f /etc/ssh/$(keys).pub",
                                                noshell),
                                     "\s+", 5), 1),
        meta => { "inventory", "attribute_name=SSH HostKey Fingerprint" };

  reports:
      "/etc/ssh/$(keys).pub
        type: $($(keys)[type])
        fingerprint: $(fingerprint[$(keys)])";
}
bundle agent __main__{methods:"example_inventory_ssh_host_keys";}

R: /etc/ssh/ssh_host_ed25519_key.pub
        type: ed25519
        fingerprint: SHA256:NA04HcvSPZ/wAp/vJUIcOV799ImTWnbFEX0R9R2SXUI
R: /etc/ssh/ssh_host_ecdsa_key.pub
        type: ecdsa
        fingerprint: SHA256:gN37F6qt7vkYvVzxgOii5hNzu7EPJw/yTvEnRtr+rLk
R: /etc/ssh/ssh_host_dsa_key.pub
        type: dsa
        fingerprint: SHA256:/5b5NncWQL43gi9AQarZvVoQW5M+LJxk8KqFYGvZpqI
R: /etc/ssh/ssh_host_rsa_key.pub
        type: rsa
        fingerprint: SHA256:tSRcjuKPF6W/jcyhqYG7tHlVkcrUZGh0RmwFEEpMPzc

Interacting with APIs from within CFEngine Policy

examples/example-url_get-wtfismyip-v0.cf

bundle agent example_url_get_wtfismyip_v0
{
  vars:
      # This is the URL that we will query.
      "url" string => "https://wtfismyip.com/json";

      # We don't need to supply any specific options in this case.
      # url.max_content is a typical setting to change. 4K isn't enough for
      # some, (many?) API responses.
      "options" data => '{}';

      # Here we make our http(s) call, storing the response in `d`
      "d" data => url_get( $(url), @(options));

      # The response content is returned as a *string* inside the `content`. In
      # order to work with it, we need to pull it into a proper data container.
      "content" data => "$(d[content])";

  reports:

      # Let's view the multi-line JSON representation of the `url_get()` response.
      "$(with)" with => string_mustache( "{{%-top-}}", d);

      # Let's view the multi-line JSON representation of our extracted `content`
      # datacontainer.
      "$(with)" with => string_mustache( "{{%-top-}}", content);
}
bundle agent __main__{methods:"example_url_get_wtfismyip_v0";}

# cf-agent --no-lock --log-level info --file examples/example-url_get-wtfismyip-v0.cf
R: {
  "content": "{\n    \"YourFuckingIPAddress\": \"24.143.34.87\",\n    \"YourFuckingLocation\": \"Tonganoxie, KS, United States\",\n    \"YourFuckingHostname\": \"24-143-34-87-dynamic.midco.net\",\n    \"YourFuckingISP\": \"Midco\",\n    \"YourFuckingTorExit\": false,\n    \"YourFuckingCountryCode\": \"US\"\n}\n",
  "headers": "HTTP/1.1 200 OK\r\nAccess-Control-Allow-Methods: GET\r\nAccess-Control-Allow-Origin: *\r\nContent-Type: application/json\r\nDate: Fri, 28 Feb 2020 14:23:28 GMT\r\nContent-Length: 268\r\n\r\n",
  "rc": 0,
  "returncode": 200,
  "success": true
}
R: {
  "YourFuckingCountryCode": "US",
  "YourFuckingHostname": "24-143-34-87-dynamic.midco.net",
  "YourFuckingIPAddress": "24.143.34.87",
  "YourFuckingISP": "Midco",
  "YourFuckingLocation": "Tonganoxie, KS, United States",
  "YourFuckingTorExit": false
}

Policy Exercises

Edit a file

Write a policy that populates /etc/issue with legaleze.

Create local users

Write a policy that creates at least 2 users.

Inventory the local users

Tag the variable(s) that contain the usernames you promised for inventory.

meta => { "inventory", "attribute_name=My users" } 

Create a file

Write a policy that ensures /etc/cron.allow is populated with one of the previously created users allowed to have cron jobs.

Switch to a user and try to crontab -e.

Inventory users in /etc/cron.allow

Inventory the users listed in /etc/cron.allow

Enable sshd banner

Write a policy that enables the ssh banner and directs it to /etc/issue. sshd should be restarted after changing its configuration.

Multiple outcomes

touch /tmp/immutable
sudo chattr +i /tmp/immutable

    info: Inserted the promised line 'I want to edit an immutable file' into '/tmp/immutable' after locator
    info: insert_lines promise 'I want to edit an immutable file' repaired
   error: Can't rename '/tmp/immutable.cf-after-edit' to '/tmp/immutable' - so promised edits could not be moved into place. (rename: Operation not permitted)
   error: Unable to save file '/tmp/immutable' after editing
   error: Errors encountered when actuating files promise '/tmp/immutable'
R: Found Class = 'my_id_failed'
R: Found Class = 'my_id_not_kept'
R: Found Class = 'my_id_error'
R: Found Class = 'my_id_kept'
R: Found Class = 'my_id_reached'
   error: Method 'example_multiple_outcomes' failed in some repairs

Refer to implementation of the results classes body in the stdlib.

sudo chattr -i /tmp/immutable
sudo rm /tmp/immutable

Report

Write a policy that defines a name in separate parts (at least 3). Then have CFEngine report the name in a random order.

Example solution

bundle agent example_report_randomized_strings_v0
{
  vars:
    "name_parts" slist => { "Ronald", "Mck", "Donald" };
    "shuffled" slist => shuffle( name_parts, randomint(0, inf) );
    "name" string => join(" ", shuffled );

  reports:
    "$(name)";
}
bundle agent __main__{methods:"example_report_randomized_strings_v0";}

R: Ronald Donald Mck
R: Mck Ronald Donald
R: Donald Ronald Mck

Trigger an action when a file changes

Write policy to monitor a file for change. When a change is seen report Winner Winner Chicken Dinner. Manually edit the file, show how cfengine detects and reports on the change.

Automatically abort based on file presence

Write a policy that will abort cfengine execution if the file $(sys.statedir)/abort_agent_execution exists.

• See abortclasses in the cfengine documentation

Delete file based on age

Write a policy that will delete $(sys.statedir)/abort_agent_execution if it is older than 1 hour.

Kill a process

Write a policy to kill irssi running on webservers. No need for our webservers to be connected to IRC.

cp /bin/sleep /tmp/irssi
/tmp/irssi 5000

Building on example-url_get-wtfismyip-v0.cf

• Let's use the response content from the previous example in a template to manage a file.

examples/example-url_get-wtfismyip-v1.cf

• Now, let's extend it further.
• After updating the file, let's do something, like run a command or restart a service.
• hint, define a class as the result of the promise

examples/example-url_get-wtfismyip-v2.cf

• Was your subsequent promise actuated?

• Find the classes that were defined

• File updated?
• Classes expected defined?

• Separate the files promise into discrete parts
• Again, mess with the file so that it will be repaired

• Adjust url.max_content size in options for url_get()

Inventory batteries

• /sys/class/power_supply/BAT*/capacity
  • What batteries are present
  • What are their capacities
  • More than 1? Aggregate capacity
  • Broken batteries?

Enterprise Reporting

APIs

• Host
• Inventory
• File Changes
• Health
• Query
• Settings
  • Federated Reporting
  • Import & Export
  • LDAP
  • Users
  • Version Control
  • RBAC

Host API

curl -s -k --user $AUTHUSER:$PASSWORD \
  https://$HUB/api/host\?count\=2\&context-include\=cfengine_3_15_0

Inventory API

Inventory API attributes

curl -q -k --user $AUTHUSER:$PASSWORD \
  -X GET \
  https://$HUB/api/inventory/attributes-dictionary | \
  jq 'map(.attribute_name)[]'

curl -q -k --user $AUTHUSER:$PASSWORD \
  -X GET \
  https://$HUB/api/inventory/attributes-dictionary | \
  jq 'map(.attribute_name)[]'

"Policy Release Id"
"EC2 Image ID"
"CPU sockets"
"Uptime minutes"
"System product name"
"System manufacturer"
"SSH Host Key /etc/ssh/ssh_host_rsa_key.pub SHA256 Fingerprint"
"CISOfy Lynis finding count"
"Number linux kernel modules loaded"
"CISOfy Lynis datetime scan completed"
"Unexpected Local Users"
"SSH Host Key /etc/ssh/ssh_host_ecdsa_key.pub SHA256 Fingerprint"
"Last logged in ubuntu"
"Windows roles"
"IPv4 addresses"
"SSH Host Key Type /etc/ssh/ssh_host_ecdsa_key.pub"
"CMDB Business Unit"
"DigitalOcean Droplet ID"
"SSH Host Key Type /etc/ssh/ssh_host_dsa_key.pub"
"BIOS version"
"Memory size (MB)"
"MAC addresses"
"Last logged in cfapache"
"CISOfy Lynis Suggestion SSH-7408 details"
"OS kernel"
"Last logged in root"
"NAT Public IPv4"
"EC2 Instance ID"
"CFEngine ID"
"CISOfy Lynis Version"
"CISOcy Lynis Remediaitons implicitly enabled"
"Volume / Percent Disk Used"
"SSH Host Key Type /etc/ssh/ssh_host_ed25519_key.pub"
"EventLog MaxSize"
"Architecture"
"OS"
"CISOfy Lynis Suggestions"
"Virtual host"
"SSH Host Key Types"
"SSH Host Keys"
"ARRAY CISOcy Lynis Remediaitons implicitly enabled"
"Number linux kernel moduels unused"
"SSH Host Key /etc/ssh/ssh_host_dsa_key.pub SHA256 Fingerprint"
"EventLog Retention"
"CFEngine roles"
"Local Users"
"CMDB Owner"
"CISOfy Lynis Control ID findings"
"SSH Host Key /etc/ssh/ssh_host_ed25519_key.pub SHA256 Fingerprint"
"legal notice caption"
"DigitalOcean Region"
"legal notice"
"Local User"
"Unused linux kernel modules"
"Data Container"
"Last logged in centos"
"CISOfy Lynis Hardening Index"
"CFEngine version"
"CISOfy Lynis Remediations explicitly disabled"
"Host name"
"SSH Host Key Fingerprint (ssh-keygen)"
"System UUID"
"System version"
"Registered Orginization"
"BIOS vendor"
"OS type"
"Disk free (%)"
"CISOfy Lynis Suggestion KRNL-6000 details"
"Ports listening"
"Users who have logged in"
"Last logged in nickanderson"
"EC2 Region"
"Interfaces"
"CISOfy Lynis Warnings"
"EC2 Availability Zone"
"Physical memory (MB)"
"Last logged in cfpostgres"
"Show Last Logged in Username"
"CPU physical cores"
"Volume /tmp Percent Disk Used"
"CPU logical cores"
"Volume /var Percent Disk Used"
"System serial number"
"Systemd services running"
"EC2 Instance Type"
"TestArray"
"Unexpected local user count"
"Used linux kernel modules"
"Registered Owner"
"SSH Host Key Type /etc/ssh/ssh_host_rsa_key.pub"
"CPU model"
"Cloud Provider"

Inventory API Query

curl -q -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/inventory \
  -H 'content-type: application/json' \
  -d '{
        "sort":"Host name",
        "select":[
           "Host name",
           "OS",
           "Policy Release Id",
           "IPv4 addresses",
           "CFEngine version",
           "Ports listening"
        ],
        "hostContextInclude":[
           "cfengine"
        ],
        "hostContextExclude":[
           "coreos"
        ]
      }
'

Health API

curl -s -k --user $AUTHUSER:$PASSWORD \
  https://$HUB/api/health-diagnostic/status/ | jq

{
  "hostsNeverCollected": 2,
  "notRecentlyCollected": 3,
  "hostsUsingSameIdentity": 0,
  "agentNotRunRecently": 0,
  "lastAgentRunUnsuccessful": 0,
  "totalFailed": 5,
  "total": "8"
}

curl -s -k --user $AUTHUSER:$PASSWORD \
  https://$HUB/api/health-diagnostic/report_ids | jq

curl -s -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/health-diagnostic/report/hostsNeverCollected \
  -H 'Content-Type: application/json' \
  -d '{"limit": 50}' | jq

Query API

curl -q -k --user $AUTHUSER:$PASSWORD \
  -X POST \
  https://$HUB/api/query \
  -H 'content-type: application/json' \
  -d '{
        "query": "select hostname, ipaddress from hosts",
        "limit": 2,
        "hostContextExclude": ["policy_server"]
     }'

Base64 encoded query links

HUB_URL="https://hub"
API="/index.php/advancedreports/#/report/run?sql="
SQL_QUERY="SELECT Hosts.HostName AS 'Host Name' FROM Hosts"
REPORT_TITLE="Example Report"
LINK="${HUB_URL}${API}$(echo ${SQL_QUERY} | \
       base64)&title=$(/usr/bin/urlencode ${REPORT_TITLE})"
echo "${LINK}"

What's New

Coming up in 3.17

• execresult() can capture stdout, stderr, or both
• execresult_as_data()

In 3.16

Components

Usage: cf-secret COMMAND [OPTIONS] [FILE]

Commands:
  encrypt      - Encrypt data for one or more hosts/keys.
                 Usage: cf-secret encrypt -k/-H KEY/HOST -o OUTPUT INPUT
  decrypt      - Decrypt data.
                 Usage: cf-secret decrypt [-k/-H KEY/HOST] -o OUTPUT INPUT
  print-headers - Print headers from an encrypted file.
                 Usage: cf-secret print-headers ENCRYPTED_FILE

Options:
  --help        , -h       - Print the help message
  --manpage     , -M       - Print the man page
  --debug       , -d       - Enable debugging output
  --verbose     , -v       - Enable verbose output
  --log-level   , -g value - Specify how detailed logs should be. Possible values: 'error', 'warning', 'notice', 'info', 'verbose', 'debug'
  --inform      , -I       - Enable basic information output
  --key         , -k value - Comma-separated list of key files to use (one of -k/-H options is required for encryption)
  --host        , -H value - Comma-separated list of hosts to encrypt/decrypt for (defaults to 'localhost' for decryption)
  --output      , -o value - Output file (required)

Website: http://www.cfengine.com
This software is Copyright (C) 2008,2010-present Northern.tech AS.

cf-secret encrypt \
  --key ~/.cfagent/ppkeys/localhost.pub \
  --output /tmp/secrets.json.cfsecret \
  <\(echo '{ "username": "secret_user", "password": "secret_token" }'\)
cf-secret print-headers /tmp/secrets.json.cfsecret

Version: 1.0
Encrypted-for: SHA=43c979e264924d0b4a2d3b568d71ab8c768ef63487670f2c51cd85e8cec63834

bundle agent example_load_encrypted_data
{
  vars:
      "decrypt_cmd"
        string => concat( "$(sys.bindir)/cf-secret decrypt ",
                          "--key $(sys.workdir)/ppkeys/localhost.priv ",
                          "--output - ",
                          "/tmp/secrets.json.cfsecret" );

      "d" data => parsejson( execresult( $(decrypt_cmd), noshell) );

  reports:
      "username: $(d[username])";
      "password: $(d[password])";
}
bundle agent __main__
{
  methods:
      "example_load_encrypted_data";
}

R: username: secret_user
R: password: secret_token

Promise attributes

bundle agent example_file_content
# @brief Example showing files content
{
  files:
      "/tmp/hello_string"
        create => "true",
        content => "Hello from string!";

  reports:
      "/tmp/hello_string"
        printfile => cat( $(this.promiser) );
}

bundle agent __main__
{
  methods: "example_file_content";
}

    info: Created file '/tmp/hello_string', mode 0600
    info: Updated content of '/tmp/hello_string' with content 'Hello from string!'
    info: files promise '/tmp/hello_string' repaired
R: /tmp/hello_string
R: Hello from string!

Functions

Complementary to new macros:

• cf_version_after()
• cf_version_at()
• cf_version_before()
• cf_version_between()
• cf_version_maximum()
• cf_version_maximum()
• cf_version_minimum()

bundle agent example_cf_after_version_function
{
  reports:
      "$(sys.cf_version) is newer than 3.7.0"
        if => cf_version_after("3.7.0");

      "$(sys.cf_version) is NOT newer than 3.7.0"
        unless => cf_version_after("3.7.0");
}
bundle agent __main__
{
  methods: "example_cf_after_version_function";
}

R: 3.17.0a.82c3b3656 is newer than 3.7.0

Manipulating strings:

• string_trim()

bundle agent example_string_trim
{
  vars:
    "my_string" string => " Trim me please ";
  reports:
      "my_string: '$(with)'"
         with => $(my_string);

      "my_string trimmed: '$(with)'"
         with => string_trim( $(my_string) );

}
bundle agent __main__
{
  methods: "example_string_trim";
}

R: my_string: ' Trim me please '
R: my_string trimmed: 'Trim me please'

Data validation:

• validdata()
• validjson()

bundle agent example_validjson
{
  vars:
    "valid_json" string => '{ "valid": "json" }';
    "invalid_json" string => '{ "invalid": "json"';
  reports:
      "valid_json is valid json"
         if => validjson( $(valid_json) );

      "valid_json is NOT valid json"
         unless => validjson( $(invalid_json) );

}
bundle agent __main__
{
  methods: "example_validjson";
}

R: valid_json is valid json
R: valid_json is NOT valid json

Macros

• maximum_version
• else
• at_version
• between_versions
• before_version
• after_version

bundle agent example_macros_new_in_cfengine_3_16
{
@if after_version(3.7.0)
  reports:
      "$(sys.cf_version) is newer than 3.7.0";
@else
      "$(sys.cf_version) is NOT newer than 3.7.0";
@endif
}
bundle agent __main__
{
  methods: "example_macros_new_in_cfengine_3_16";
}

R: 3.17.0a.82c3b3656 is newer than 3.7.0

Enterprise Edition

• Compliance Reports

In 3.15

Functions

• basename()
• read_module_protocol()

bundle agent example_basename
{
  vars:
      "basename" -> { "CFE-3196" }
        string => basename( $(this.promise_filename) );

      "basename_wo_extension" -> { "CFE-3196" }
        string => basename( $(this.promise_filename), ".cf" );
  reports:

      "basename = '$(basename)'";
      "basename without '.cf' extension = '$(basename_wo_extension)'";
}

# cf-agent --bundlesequence example_basename --no-lock --log-level info --file /home/nickanderson/src/presentations/state-of-the-cfengine/cfengine3-NiK6sU
    info: Using command line specified bundlesequence
R: basename = 'cfengine3-NiK6sU'
R: basename without '.cf' extension = 'cfengine3-NiK6sU'

R: Module cache was read!
R: cached_module.my_variable = Mon Feb  3 05:32:05 2020

In 3.14

Functions

• classfiltercsv() (back-ported to 3.12.1)

NOTE: CRLF (Windows/DOS) line endings required per RFC

dos2unix ./examples/classfiltercsv.csv

R: Filtered data: [
  {
    "Sort": "1",
    "Token": "net.ipv4.ip_forward",
    "Value": "127.0.0.4"
  },
  {
    "Sort": "A",
    "Token": "net.ipv4.ip_forward",
    "Value": "ANYVALUE"
  },
  {
    "Sort": "a",
    "Token": "net.ipv4.ip_forward",
    "Value": "127.0.0.3"
  },
  {
    "Sort": "z",
    "Token": "net.ipv4.ip_forward",
    "Value": "ANYVALUE"
  }
]

In 3.13

Functions

• string_replace()

bundle agent example_string_replace
{
  vars:
      "my_string"
        string => "Bash is the best config management tool";
  reports:
      "$(with)" with => string_replace( $(my_string),
                                        "Bash", "CFEngine" );
}
bundle agent __main__
{
  methods: "example_string_replace";
}

R: CFEngine is the best config management tool

In 3.12

Functions

• hash_to_int()

bundle agent example_hash_to_int
{
  vars:
      "hello"  int => hash_to_int(0, 1000, "hello");
      "world"  int => hash_to_int(0, 1000, "world");

      # Hash can vary on hostkey or policy hub:
      "hour"   int => hash_to_int(0, 24, "$(sys.key_digest)");
      "minute" int => hash_to_int(0, 60, "$(sys.policy_hub)");

  reports:
      "'hello' hashed to: $(hello)";
      "'world' hashed to: $(world)";

}
bundle agent __main__{methods: "example_hash_to_int";}

R: 'hello' hashed to: 172
R: 'world' hashed to: 760

Library main bundles

• Default bundle per policy file
• Useful for testing

What output do you get when you run the policy file ?

cf-agent -KIf ./example_library__main__1.cf

R: Hello from example_library__main__1

bundle agent example_library__main__2
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__2";
}

cf-agent -KIf ./example_library__main__2.cf

R: Hello from example_library__main__2

What output do you get when you run the policy file ?

cf-agent -KIf ./example_library__main__.cf

example_library__main__1.cf
example_library__main__2.cf
example_library__main__.cf
#!/var/cfengine/bin/cf-agent -f-
body file control
{
      inputs => { '$(sys.libdir)/stdlib.cf' };
}

bundle agent example_library__main__1
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__1";
}
#!/var/cfengine/bin/cf-agent -f-
body file control
{
      inputs => { '$(sys.libdir)/stdlib.cf' };
}

bundle agent example_library__main__2
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  methods:
      "example_library__main__2";
}
#!/var/cfengine/bin/cf-agent -f-
body file control
{
      inputs => { '$(sys.libdir)/stdlib.cf' };
}

body file control
{
  inputs => {
              "example_library__main__1.cf",
              "example_library__main__2.cf",
            };
}
bundle agent example_library__main__
{
  reports: "Hello from $(this.bundle)";
}
bundle agent __main__
{
  vars: "b" slist => bundlesmatching( "example_.*" );
  methods:
      "example_library__main__";
      "example_library__main__1";
      "example_library__main__2";
  reports: "$(b)";
}
R: Hello from example_library__main__
   error: A method attempted to use a bundle 'example_library__main__1' that was apparently not defined
   error: A method attempted to use a bundle 'example_library__main__2' that was apparently not defined

–log-level option

bundle agent main
{
  reports:
    inform_mode:: "Running with info level logging";
}

# cf-agent --no-lock --inform --file ./examples/example_log_level_inform.cf
R: Running with info level logging

# cf-agent --no-lock --log-level inform --file ./examples/example_log_level_inform.cf
R: Running with info level logging

Promise attributes

• copy_from body attribute missing_ok allows missing upstream files to be considered promise kept
• files promise template_method accepts inline_mustache
• files promise edit_template_string defines inline mustache

R: [
  "copy_from_missing_ok_kept",
  "copy_from_missing_ok_reached"
]

# cf-agent --no-lock --file examples/whats_new_3_12_inline_mustache.cf
R: /tmp/example_inline_mustache
R: Did you know that Bruce Wayne
R: ... is really Batman!?

sys vars

• sys.policy_entry*

In 3.11

Promise attributes

• with

Functions

• data_sysctlvalues()
• readenvfile()
• sysctlvalue()

bundle agent example_data_sysctlvalues
{
  vars:
      "_d" data => data_sysctlvalues();
  reports:
      "$(with)"
        with => string_mustache( "{{%-top-}}", _d );
}
bundle agent __main__
{
      methods: "example_data_sysctlvalues";
}

R: {
  "abi.vsyscall32": "1",
  "debug.exception-trace": "1",
  "debug.kprobes-optimization": "1",
  "dev.cdrom.autoclose": "1",
  "dev.cdrom.autoeject": "0",
  "dev.cdrom.check_media": "0",
  "dev.cdrom.debug": "0",
  "dev.cdrom.info": "CD-ROM information, Id: cdrom.c 3.20 2003/12/17\n\ndrive name:\t\ndrive speed:\t\ndrive # of slots:\nCan close tray:\t\nCan open tray:\t\nCan lock tray:\t\nCan change speed:\nCan select disk:\nCan read multisession:\nCan read MCN:\t\nReports media changed:\nCan play audio:\t\nCan write CD-R:\t\nCan write CD-RW:\nCan read DVD:\t\nCan write DVD-R:\nCan write DVD-RAM:\nCan read MRW:\t\nCan write MRW:\t\nCan write RAM:\t",
  "dev.cdrom.lock": "0",
  "dev.hpet.max-user-freq": "64",
  "dev.i915.oa_max_sample_rate": "100000",
  "dev.i915.perf_stream_paranoid": "1",
  "dev.mac_hid.mouse_button2_keycode": "97",
  "dev.mac_hid.mouse_button3_keycode": "100",
  "dev.mac_hid.mouse_button_emulation": "0",
  "dev.parport.default.spintime": "500",
  "dev.parport.default.timeslice": "200",
  "dev.raid.speed_limit_max": "200000",
  "dev.raid.speed_limit_min": "1000",
  "dev.scsi.logging_level": "0",
  "dev.tty.ldisc_autoload": "1",
  "fs.aio-max-nr": "65536",
  "fs.aio-nr": "3301",
  "fs.binfmt_misc.cli": "enabled\ninterpreter /usr/lib/binfmt-support/run-detectors\nflags: \noffset 0\nmagic 4d5a",
  "fs.binfmt_misc.jar": "enabled\ninterpreter /usr/bin/jexec\nflags: \noffset 0\nmagic 504b0304",
  "fs.binfmt_misc.python2.7": "enabled\ninterpreter /usr/bin/python2.7\nflags: \noffset 0\nmagic 03f30d0a",
  "fs.binfmt_misc.python3.8": "enabled\ninterpreter /usr/bin/python3.8\nflags: \noffset 0\nmagic 550d0d0a",
  "fs.binfmt_misc.sbcl": "enabled\ninterpreter /usr/lib/sbcl/sbcl-run\nflags: \noffset 0\nmagic 23204641534c0a",
  "fs.binfmt_misc.status": "enabled",
  "fs.dentry-state": "311030\t222679\t45\t0\t42660\t0",
  "fs.dir-notify-enable": "1",
  "fs.epoll.max_user_watches": "6698721",
  "fs.file-max": "9223372036854775807",
  "fs.file-nr": "46048\t0\t9223372036854775807",
  "fs.inode-nr": "507770\t238746",
  "fs.inode-state": "507770\t238746\t0\t0\t0\t0\t0",
  "fs.inotify.max_queued_events": "16384",
  "fs.inotify.max_user_instances": "128",
  "fs.inotify.max_user_watches": "98304",
  "fs.lease-break-time": "45",
  "fs.leases-enable": "1",
  "fs.mount-max": "100000",
  "fs.mqueue.msg_default": "10",
  "fs.mqueue.msg_max": "10",
  "fs.mqueue.msgsize_default": "8192",
  "fs.mqueue.msgsize_max": "8192",
  "fs.mqueue.queues_max": "256",
  "fs.nfs.idmap_cache_timeout": "600",
  "fs.nfs.nfs_callback_tcpport": "0",
  "fs.nfs.nfs_congestion_kb": "183104",
  "fs.nfs.nfs_mountpoint_timeout": "500",
  "fs.nfs.nlm_grace_period": "0",
  "fs.nfs.nlm_tcpport": "0",
  "fs.nfs.nlm_timeout": "10",
  "fs.nfs.nlm_udpport": "0",
  "fs.nfs.nsm_local_state": "3",
  "fs.nfs.nsm_use_hostnames": "0",
  "fs.nr_open": "1048576",
  "fs.overflowgid": "65534",
  "fs.overflowuid": "65534",
  "fs.pipe-max-size": "1048576",
  "fs.pipe-user-pages-hard": "0",
  "fs.pipe-user-pages-soft": "16384",
  "fs.quota.allocated_dquots": "0",
  "fs.quota.cache_hits": "0",
  "fs.quota.drops": "0",
  "fs.quota.free_dquots": "0",
  "fs.quota.lookups": "0",
  "fs.quota.reads": "0",
  "fs.quota.syncs": "26",
  "fs.quota.writes": "0",
  "fs.suid_dumpable": "2",
  "fs.verity.require_signatures": "0",
  "fscache.object_max_active": "8",
  "fscache.operation_max_active": "4",
  "kernel.acct": "4\t2\t30",
  "kernel.acpi_video_flags": "0",
  "kernel.auto_msgmni": "0",
  "kernel.bootloader_type": "6",
  "kernel.bootloader_version": "38",
  "kernel.bpf_stats_enabled": "0",
  "kernel.cap_last_cap": "37",
  "kernel.core_pattern": "|/usr/share/apport/apport %p %s %c %d %P %E",
  "kernel.core_pipe_limit": "0",
  "kernel.core_uses_pid": "0",
  "kernel.ctrl-alt-del": "0",
  "kernel.dmesg_restrict": "0",
  "kernel.domainname": "(none)",
  "kernel.firmware_config.force_sysfs_fallback": "0",
  "kernel.firmware_config.ignore_sysfs_fallback": "0",
  "kernel.ftrace_dump_on_oops": "0",
  "kernel.ftrace_enabled": "1",
  "kernel.hardlockup_all_cpu_backtrace": "0",
  "kernel.hardlockup_panic": "0",
  "kernel.hostname": "nickanderson-ThinkPad-W550s",
  "kernel.hotplug": "",
  "kernel.hung_task_check_count": "4194304",
  "kernel.hung_task_check_interval_secs": "0",
  "kernel.hung_task_panic": "0",
  "kernel.hung_task_timeout_secs": "120",
  "kernel.hung_task_warnings": "8",
  "kernel.io_delay_type": "1",
  "kernel.kexec_load_disabled": "0",
  "kernel.keys.gc_delay": "300",
  "kernel.keys.maxbytes": "20000",
  "kernel.keys.maxkeys": "200",
  "kernel.keys.persistent_keyring_expiry": "259200",
  "kernel.keys.root_maxbytes": "25000000",
  "kernel.keys.root_maxkeys": "1000000",
  "kernel.kptr_restrict": "1",
  "kernel.latencytop": "0",
  "kernel.max_lock_depth": "1024",
  "kernel.modprobe": "/sbin/modprobe",
  "kernel.modules_disabled": "0",
  "kernel.msg_next_id": "-1",
  "kernel.msgmax": "8192",
  "kernel.msgmnb": "16384",
  "kernel.msgmni": "32000",
  "kernel.ngroups_max": "65536",
  "kernel.nmi_watchdog": "0",
  "kernel.ns_last_pid": "1116084",
  "kernel.numa_balancing": "0",
  "kernel.numa_balancing_scan_delay_ms": "1000",
  "kernel.numa_balancing_scan_period_max_ms": "60000",
  "kernel.numa_balancing_scan_period_min_ms": "1000",
  "kernel.numa_balancing_scan_size_mb": "256",
  "kernel.osrelease": "5.4.0-42-lowlatency",
  "kernel.ostype": "Linux",
  "kernel.overflowgid": "65534",
  "kernel.overflowuid": "65534",
  "kernel.panic": "0",
  "kernel.panic_on_io_nmi": "0",
  "kernel.panic_on_oops": "0",
  "kernel.panic_on_rcu_stall": "0",
  "kernel.panic_on_unrecovered_nmi": "0",
  "kernel.panic_on_warn": "0",
  "kernel.panic_print": "0",
  "kernel.perf_cpu_time_max_percent": "25",
  "kernel.perf_event_max_contexts_per_stack": "8",
  "kernel.perf_event_max_sample_rate": "100000",
  "kernel.perf_event_max_stack": "127",
  "kernel.perf_event_mlock_kb": "516",
  "kernel.perf_event_paranoid": "3",
  "kernel.pid_max": "4194304",
  "kernel.poweroff_cmd": "/sbin/poweroff",
  "kernel.print-fatal-signals": "0",
  "kernel.printk": "4\t4\t1\t7",
  "kernel.printk_delay": "0",
  "kernel.printk_devkmsg": "on",
  "kernel.printk_ratelimit": "5",
  "kernel.printk_ratelimit_burst": "10",
  "kernel.pty.max": "4096",
  "kernel.pty.nr": "8",
  "kernel.pty.reserve": "1024",
  "kernel.random.boot_id": "fdf58181-01bd-4d59-a45d-c56bca7eceef",
  "kernel.random.entropy_avail": "3936",
  "kernel.random.poolsize": "4096",
  "kernel.random.read_wakeup_threshold": "64",
  "kernel.random.urandom_min_reseed_secs": "60",
  "kernel.random.uuid": "81b27359-dcd8-4d6b-9173-1ae8b4d71a94",
  "kernel.random.write_wakeup_threshold": "1024",
  "kernel.randomize_va_space": "2",
  "kernel.real-root-dev": "0",
  "kernel.sched_autogroup_enabled": "1",
  "kernel.sched_cfs_bandwidth_slice_us": "5000",
  "kernel.sched_child_runs_first": "0",
  "kernel.sched_domain.cpu0.domain0.busy_factor": "32",
  "kernel.sched_domain.cpu0.domain0.cache_nice_tries": "0",
  "kernel.sched_domain.cpu0.domain0.flags": "4783",
  "kernel.sched_domain.cpu0.domain0.imbalance_pct": "110",
  "kernel.sched_domain.cpu0.domain0.max_interval": "4",
  "kernel.sched_domain.cpu0.domain0.max_newidle_lb_cost": "20996",
  "kernel.sched_domain.cpu0.domain0.min_interval": "2",
  "kernel.sched_domain.cpu0.domain0.name": "SMT",
  "kernel.sched_domain.cpu0.domain1.busy_factor": "32",
  "kernel.sched_domain.cpu0.domain1.cache_nice_tries": "1",
  "kernel.sched_domain.cpu0.domain1.flags": "4655",
  "kernel.sched_domain.cpu0.domain1.imbalance_pct": "117",
  "kernel.sched_domain.cpu0.domain1.max_interval": "8",
  "kernel.sched_domain.cpu0.domain1.max_newidle_lb_cost": "18377",
  "kernel.sched_domain.cpu0.domain1.min_interval": "4",
  "kernel.sched_domain.cpu0.domain1.name": "MC",
  "kernel.sched_domain.cpu1.domain0.busy_factor": "32",
  "kernel.sched_domain.cpu1.domain0.cache_nice_tries": "0",
  "kernel.sched_domain.cpu1.domain0.flags": "4783",
  "kernel.sched_domain.cpu1.domain0.imbalance_pct": "110",
  "kernel.sched_domain.cpu1.domain0.max_interval": "4",
  "kernel.sched_domain.cpu1.domain0.max_newidle_lb_cost": "28467",
  "kernel.sched_domain.cpu1.domain0.min_interval": "2",
  "kernel.sched_domain.cpu1.domain0.name": "SMT",
  "kernel.sched_domain.cpu1.domain1.busy_factor": "32",
  "kernel.sched_domain.cpu1.domain1.cache_nice_tries": "1",
  "kernel.sched_domain.cpu1.domain1.flags": "4655",
  "kernel.sched_domain.cpu1.domain1.imbalance_pct": "117",
  "kernel.sched_domain.cpu1.domain1.max_interval": "8",
  "kernel.sched_domain.cpu1.domain1.max_newidle_lb_cost": "24312",
  "kernel.sched_domain.cpu1.domain1.min_interval": "4",
  "kernel.sched_domain.cpu1.domain1.name": "MC",
  "kernel.sched_domain.cpu2.domain0.busy_factor": "32",
  "kernel.sched_domain.cpu2.domain0.cache_nice_tries": "0",
  "kernel.sched_domain.cpu2.domain0.flags": "4783",
  "kernel.sched_domain.cpu2.domain0.imbalance_pct": "110",
  "kernel.sched_domain.cpu2.domain0.max_interval": "4",
  "kernel.sched_domain.cpu2.domain0.max_newidle_lb_cost": "25634",
  "kernel.sched_domain.cpu2.domain0.min_interval": "2",
  "kernel.sched_domain.cpu2.domain0.name": "SMT",
  "kernel.sched_domain.cpu2.domain1.busy_factor": "32",
  "kernel.sched_domain.cpu2.domain1.cache_nice_tries": "1",
  "kernel.sched_domain.cpu2.domain1.flags": "4655",
  "kernel.sched_domain.cpu2.domain1.imbalance_pct": "117",
  "kernel.sched_domain.cpu2.domain1.max_interval": "8",
  "kernel.sched_domain.cpu2.domain1.max_newidle_lb_cost": "20399",
  "kernel.sched_domain.cpu2.domain1.min_interval": "4",
  "kernel.sched_domain.cpu2.domain1.name": "MC",
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  "kernel.sched_domain.cpu3.domain0.cache_nice_tries": "0",
  "kernel.sched_domain.cpu3.domain0.flags": "4783",
  "kernel.sched_domain.cpu3.domain0.imbalance_pct": "110",
  "kernel.sched_domain.cpu3.domain0.max_interval": "4",
  "kernel.sched_domain.cpu3.domain0.max_newidle_lb_cost": "20811",
  "kernel.sched_domain.cpu3.domain0.min_interval": "2",
  "kernel.sched_domain.cpu3.domain0.name": "SMT",
  "kernel.sched_domain.cpu3.domain1.busy_factor": "32",
  "kernel.sched_domain.cpu3.domain1.cache_nice_tries": "1",
  "kernel.sched_domain.cpu3.domain1.flags": "4655",
  "kernel.sched_domain.cpu3.domain1.imbalance_pct": "117",
  "kernel.sched_domain.cpu3.domain1.max_interval": "8",
  "kernel.sched_domain.cpu3.domain1.max_newidle_lb_cost": "21132",
  "kernel.sched_domain.cpu3.domain1.min_interval": "4",
  "kernel.sched_domain.cpu3.domain1.name": "MC",
  "kernel.sched_latency_ns": "18000000",
  "kernel.sched_migration_cost_ns": "500000",
  "kernel.sched_min_granularity_ns": "2250000",
  "kernel.sched_nr_migrate": "32",
  "kernel.sched_rr_timeslice_ms": "100",
  "kernel.sched_rt_period_us": "1000000",
  "kernel.sched_rt_runtime_us": "950000",
  "kernel.sched_schedstats": "0",
  "kernel.sched_tunable_scaling": "1",
  "kernel.sched_util_clamp_max": "1024",
  "kernel.sched_util_clamp_min": "1024",
  "kernel.sched_wakeup_granularity_ns": "3000000",
  "kernel.seccomp.actions_avail": "kill_process kill_thread trap errno user_notif trace log allow",
  "kernel.seccomp.actions_logged": "kill_process kill_thread trap errno user_notif trace log",
  "kernel.sem": "32000\t1024000000\t500\t32000",
  "kernel.sem_next_id": "-1",
  "kernel.sg-big-buff": "32768",
  "kernel.shm_next_id": "-1",
  "kernel.shm_rmid_forced": "0",
  "kernel.shmall": "18446744073692774399",
  "kernel.shmmax": "18446744073692774399",
  "kernel.shmmni": "4096",
  "kernel.soft_watchdog": "1",
  "kernel.softlockup_all_cpu_backtrace": "0",
  "kernel.softlockup_panic": "0",
  "kernel.stack_tracer_enabled": "0",
  "kernel.sysctl_writes_strict": "1",
  "kernel.sysrq": "176",
  "kernel.tainted": "5632",
  "kernel.threads-max": "255535",
  "kernel.timer_migration": "1",
  "kernel.traceoff_on_warning": "0",
  "kernel.tracepoint_printk": "0",
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  "kernel.unprivileged_bpf_disabled": "0",
  "kernel.unprivileged_userns_clone": "1",
  "kernel.version": "#46-Ubuntu SMP PREEMPT Fri Jul 10 01:43:58 UTC 2020",
  "kernel.watchdog": "1",
  "kernel.watchdog_cpumask": "0-7",
  "kernel.watchdog_thresh": "10",
  "kernel.yama.ptrace_scope": "1",
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  "net.bridge.bridge-nf-call-ip6tables": "1",
  "net.bridge.bridge-nf-call-iptables": "1",
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  "net.bridge.bridge-nf-filter-vlan-tagged": "0",
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  "net.core.bpf_jit_enable": "1",
  "net.core.busy_poll": "0",
  "net.core.busy_read": "0",
  "net.core.default_qdisc": "fq_codel",
  "net.core.dev_weight": "64",
  "net.core.dev_weight_rx_bias": "1",
  "net.core.dev_weight_tx_bias": "1",
  "net.core.devconf_inherit_init_net": "0",
  "net.core.fb_tunnels_only_for_init_net": "0",
  "net.core.flow_limit_cpu_bitmap": "00",
  "net.core.flow_limit_table_len": "4096",
  "net.core.gro_normal_batch": "8",
  "net.core.high_order_alloc_disable": "0",
  "net.core.max_skb_frags": "17",
  "net.core.message_burst": "10",
  "net.core.message_cost": "5",
  "net.core.netdev_budget": "300",
  "net.core.netdev_budget_usecs": "2000",
  "net.core.netdev_max_backlog": "1000",
  "net.core.netdev_rss_key": "de:cd:e7:76:dc:fb:d8:5b:ab:b6:d5:97:d1:14:ce:ac:14:23:a7:c9:07:b3:4a:e9:82:f2:a3:7d:ae:37:21:8f:0b:90:09:47:6b:9d:d6:b2:7b:40:f1:62:fd:a4:b4:a2:cb:29:72:f0",
  "net.core.netdev_tstamp_prequeue": "1",
  "net.core.optmem_max": "20480",
  "net.core.rmem_default": "212992",
  "net.core.rmem_max": "212992",
  "net.core.rps_sock_flow_entries": "0",
  "net.core.somaxconn": "4096",
  "net.core.tstamp_allow_data": "1",
  "net.core.warnings": "0",
  "net.core.wmem_default": "212992",
  "net.core.wmem_max": "212992",
  "net.core.xfrm_acq_expires": "30",
  "net.core.xfrm_aevent_etime": "10",
  "net.core.xfrm_aevent_rseqth": "2",
  "net.core.xfrm_larval_drop": "1",
  "net.ipv4.cipso_cache_bucket_size": "10",
  "net.ipv4.cipso_cache_enable": "1",
  "net.ipv4.cipso_rbm_optfmt": "0",
  "net.ipv4.cipso_rbm_strictvalid": "1",
  "net.ipv4.conf.all.accept_local": "0",
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  "net.ipv4.conf.all.force_igmp_version": "0",
  "net.ipv4.conf.all.forwarding": "1",
  "net.ipv4.conf.all.igmpv2_unsolicited_report_interval": "10000",
  "net.ipv4.conf.all.igmpv3_unsolicited_report_interval": "1000",
  "net.ipv4.conf.all.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.all.log_martians": "0",
  "net.ipv4.conf.all.mc_forwarding": "0",
  "net.ipv4.conf.all.medium_id": "0",
  "net.ipv4.conf.all.promote_secondaries": "0",
  "net.ipv4.conf.all.proxy_arp": "0",
  "net.ipv4.conf.all.proxy_arp_pvlan": "0",
  "net.ipv4.conf.all.route_localnet": "0",
  "net.ipv4.conf.all.rp_filter": "2",
  "net.ipv4.conf.all.secure_redirects": "1",
  "net.ipv4.conf.all.send_redirects": "1",
  "net.ipv4.conf.all.shared_media": "1",
  "net.ipv4.conf.all.src_valid_mark": "0",
  "net.ipv4.conf.all.tag": "0",
  "net.ipv4.conf.default.accept_local": "0",
  "net.ipv4.conf.default.accept_redirects": "1",
  "net.ipv4.conf.default.accept_source_route": "1",
  "net.ipv4.conf.default.arp_accept": "0",
  "net.ipv4.conf.default.arp_announce": "0",
  "net.ipv4.conf.default.arp_filter": "0",
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  "net.ipv4.conf.default.arp_notify": "0",
  "net.ipv4.conf.default.bc_forwarding": "0",
  "net.ipv4.conf.default.bootp_relay": "0",
  "net.ipv4.conf.default.disable_policy": "0",
  "net.ipv4.conf.default.disable_xfrm": "0",
  "net.ipv4.conf.default.drop_gratuitous_arp": "0",
  "net.ipv4.conf.default.drop_unicast_in_l2_multicast": "0",
  "net.ipv4.conf.default.force_igmp_version": "0",
  "net.ipv4.conf.default.forwarding": "1",
  "net.ipv4.conf.default.igmpv2_unsolicited_report_interval": "10000",
  "net.ipv4.conf.default.igmpv3_unsolicited_report_interval": "1000",
  "net.ipv4.conf.default.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.default.log_martians": "0",
  "net.ipv4.conf.default.mc_forwarding": "0",
  "net.ipv4.conf.default.medium_id": "0",
  "net.ipv4.conf.default.promote_secondaries": "1",
  "net.ipv4.conf.default.proxy_arp": "0",
  "net.ipv4.conf.default.proxy_arp_pvlan": "0",
  "net.ipv4.conf.default.route_localnet": "0",
  "net.ipv4.conf.default.rp_filter": "2",
  "net.ipv4.conf.default.secure_redirects": "1",
  "net.ipv4.conf.default.send_redirects": "1",
  "net.ipv4.conf.default.shared_media": "1",
  "net.ipv4.conf.default.src_valid_mark": "0",
  "net.ipv4.conf.default.tag": "0",
  "net.ipv4.conf.docker0.accept_local": "0",
  "net.ipv4.conf.docker0.accept_redirects": "1",
  "net.ipv4.conf.docker0.accept_source_route": "1",
  "net.ipv4.conf.docker0.arp_accept": "0",
  "net.ipv4.conf.docker0.arp_announce": "0",
  "net.ipv4.conf.docker0.arp_filter": "0",
  "net.ipv4.conf.docker0.arp_ignore": "0",
  "net.ipv4.conf.docker0.arp_notify": "0",
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  "net.ipv4.conf.docker0.disable_policy": "0",
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  "net.ipv4.conf.docker0.force_igmp_version": "0",
  "net.ipv4.conf.docker0.forwarding": "1",
  "net.ipv4.conf.docker0.igmpv2_unsolicited_report_interval": "10000",
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  "net.ipv4.conf.docker0.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.docker0.log_martians": "0",
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  "net.ipv4.conf.docker0.proxy_arp": "0",
  "net.ipv4.conf.docker0.proxy_arp_pvlan": "0",
  "net.ipv4.conf.docker0.route_localnet": "0",
  "net.ipv4.conf.docker0.rp_filter": "2",
  "net.ipv4.conf.docker0.secure_redirects": "1",
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  "net.ipv4.conf.docker0.shared_media": "1",
  "net.ipv4.conf.docker0.src_valid_mark": "0",
  "net.ipv4.conf.docker0.tag": "0",
  "net.ipv4.conf.eth0.accept_local": "0",
  "net.ipv4.conf.eth0.accept_redirects": "1",
  "net.ipv4.conf.eth0.accept_source_route": "1",
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  "net.ipv4.conf.eth0.force_igmp_version": "0",
  "net.ipv4.conf.eth0.forwarding": "1",
  "net.ipv4.conf.eth0.igmpv2_unsolicited_report_interval": "10000",
  "net.ipv4.conf.eth0.igmpv3_unsolicited_report_interval": "1000",
  "net.ipv4.conf.eth0.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.eth0.log_martians": "0",
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  "net.ipv4.conf.eth0.proxy_arp_pvlan": "0",
  "net.ipv4.conf.eth0.route_localnet": "0",
  "net.ipv4.conf.eth0.rp_filter": "2",
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  "net.ipv4.conf.eth0.src_valid_mark": "0",
  "net.ipv4.conf.eth0.tag": "0",
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  "net.ipv4.conf.lo.accept_redirects": "1",
  "net.ipv4.conf.lo.accept_source_route": "1",
  "net.ipv4.conf.lo.arp_accept": "0",
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  "net.ipv4.conf.lo.disable_policy": "1",
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  "net.ipv4.conf.lo.drop_gratuitous_arp": "0",
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  "net.ipv4.conf.lo.force_igmp_version": "0",
  "net.ipv4.conf.lo.forwarding": "1",
  "net.ipv4.conf.lo.igmpv2_unsolicited_report_interval": "10000",
  "net.ipv4.conf.lo.igmpv3_unsolicited_report_interval": "1000",
  "net.ipv4.conf.lo.ignore_routes_with_linkdown": "0",
  "net.ipv4.conf.lo.log_martians": "0",
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  "net.ipv4.conf.lo.proxy_arp": "0",
  "net.ipv4.conf.lo.proxy_arp_pvlan": "0",
  "net.ipv4.conf.lo.route_localnet": "0",
  "net.ipv4.conf.lo.rp_filter": "0",
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  "net.ipv4.conf.lo.src_valid_mark": "0",
  "net.ipv4.conf.lo.tag": "0",
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  "net.ipv4.conf.tun0.force_igmp_version": "0",
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  "net.ipv4.conf.tun0.log_martians": "0",
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  "net.ipv4.conf.tun0.route_localnet": "0",
  "net.ipv4.conf.tun0.rp_filter": "2",
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  "net.ipv4.conf.tun0.src_valid_mark": "0",
  "net.ipv4.conf.tun0.tag": "0",
  "net.ipv4.conf.vboxnet0.accept_local": "0",
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  "net.ipv4.conf.vboxnet0.log_martians": "0",
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  "net.ipv6.conf.tun0.router_probe_interval": "60",
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  "net.ipv6.conf.tun0.router_solicitations": "-1",
  "net.ipv6.conf.tun0.seg6_enabled": "0",
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  "net.ipv6.conf.vboxnet0.accept_dad": "1",
  "net.ipv6.conf.vboxnet0.accept_ra": "1",
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  "net.ipv6.conf.all.max_addresses": "16",
  "net.ipv6.conf.all.max_desync_factor": "600",
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  "net.ipv6.conf.vboxnet0.router_probe_interval": "60",
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  "net.ipv6.conf.vboxnet0.router_solicitations": "-1",
  "net.ipv6.conf.vboxnet0.seg6_enabled": "0",
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  "net.ipv6.route.skip_notify_on_dev_down": "0",
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  "net.netfilter.nf_conntrack_udp_timeout_stream": "120",
  "net.netfilter.nf_log.0": "NONE",
  "net.netfilter.nf_log.1": "NONE",
  "net.netfilter.nf_log.10": "NONE",
  "net.netfilter.nf_log.11": "NONE",
  "net.netfilter.nf_log.12": "NONE",
  "net.netfilter.nf_log.2": "NONE",
  "net.netfilter.nf_log.3": "NONE",
  "net.netfilter.nf_log.4": "NONE",
  "net.netfilter.nf_log.5": "NONE",
  "net.netfilter.nf_log.6": "NONE",
  "net.netfilter.nf_log.7": "NONE",
  "net.netfilter.nf_log.8": "NONE",
  "net.netfilter.nf_log.9": "NONE",
  "net.netfilter.nf_log_all_netns": "0",
  "net.nf_conntrack_max": "262144",
  "net.unix.max_dgram_qlen": "512",
  "sunrpc.max_resvport": "1023",
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  "net.ipv6.conf.all.router_solicitation_max_interval": "3600",
  "net.ipv6.conf.all.router_solicitations": "-1",
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  "net.ipv6.conf.default.mtu": "1280",
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  "net.ipv6.conf.default.router_solicitations": "-1",
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  "net.ipv6.conf.default.use_tempaddr": "2",
  "net.ipv6.conf.docker0.accept_dad": "1",
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  "net.ipv6.neigh.vboxnet2.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet2.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet2.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet2.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet2.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet2.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet2.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet3.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet3.app_solicit": "0",
  "net.ipv6.neigh.vboxnet3.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet3.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet3.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet3.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet3.locktime": "0",
  "net.ipv6.neigh.vboxnet3.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet3.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet3.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet3.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet3.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet3.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet3.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet3.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet3.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet4.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet4.app_solicit": "0",
  "net.ipv6.neigh.vboxnet4.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet4.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet4.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet4.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet4.locktime": "0",
  "net.ipv6.neigh.vboxnet4.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet4.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet4.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet4.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet4.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet4.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet4.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet4.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet4.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet5.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet5.app_solicit": "0",
  "net.ipv6.neigh.vboxnet5.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet5.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet5.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet5.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet5.locktime": "0",
  "net.ipv6.neigh.vboxnet5.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet5.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet5.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet5.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet5.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet5.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet5.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet5.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet5.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet6.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet6.app_solicit": "0",
  "net.ipv6.neigh.vboxnet6.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet6.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet6.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet6.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet6.locktime": "0",
  "net.ipv6.neigh.vboxnet6.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet6.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet6.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet6.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet6.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet6.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet6.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet6.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet6.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet7.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet7.app_solicit": "0",
  "net.ipv6.neigh.vboxnet7.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet7.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet7.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet7.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet7.locktime": "0",
  "net.ipv6.neigh.vboxnet7.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet7.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet7.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet7.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet7.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet7.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet7.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet7.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet7.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet8.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet8.app_solicit": "0",
  "net.ipv6.neigh.vboxnet8.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet8.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet8.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet8.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet8.locktime": "0",
  "net.ipv6.neigh.vboxnet8.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet8.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet8.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet8.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet8.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet8.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet8.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet8.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet8.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.vboxnet9.anycast_delay": "100",
  "net.ipv6.neigh.vboxnet9.app_solicit": "0",
  "net.ipv6.neigh.vboxnet9.base_reachable_time": "30",
  "net.ipv6.neigh.vboxnet9.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.vboxnet9.delay_first_probe_time": "5",
  "net.ipv6.neigh.vboxnet9.gc_stale_time": "60",
  "net.ipv6.neigh.vboxnet9.locktime": "0",
  "net.ipv6.neigh.vboxnet9.mcast_resolicit": "0",
  "net.ipv6.neigh.vboxnet9.mcast_solicit": "3",
  "net.ipv6.neigh.vboxnet9.proxy_delay": "80",
  "net.ipv6.neigh.vboxnet9.proxy_qlen": "64",
  "net.ipv6.neigh.vboxnet9.retrans_time": "1000",
  "net.ipv6.neigh.vboxnet9.retrans_time_ms": "1000",
  "net.ipv6.neigh.vboxnet9.ucast_solicit": "3",
  "net.ipv6.neigh.vboxnet9.unres_qlen": "101",
  "net.ipv6.neigh.vboxnet9.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.virbr0-nic.anycast_delay": "100",
  "net.ipv6.neigh.virbr0-nic.app_solicit": "0",
  "net.ipv6.neigh.virbr0-nic.base_reachable_time": "30",
  "net.ipv6.neigh.virbr0-nic.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.virbr0-nic.delay_first_probe_time": "5",
  "net.ipv6.neigh.virbr0-nic.gc_stale_time": "60",
  "net.ipv6.neigh.virbr0-nic.locktime": "0",
  "net.ipv6.neigh.virbr0-nic.mcast_resolicit": "0",
  "net.ipv6.neigh.virbr0-nic.mcast_solicit": "3",
  "net.ipv6.neigh.virbr0-nic.proxy_delay": "80",
  "net.ipv6.neigh.virbr0-nic.proxy_qlen": "64",
  "net.ipv6.neigh.virbr0-nic.retrans_time": "1000",
  "net.ipv6.neigh.virbr0-nic.retrans_time_ms": "1000",
  "net.ipv6.neigh.virbr0-nic.ucast_solicit": "3",
  "net.ipv6.neigh.virbr0-nic.unres_qlen": "101",
  "net.ipv6.neigh.virbr0-nic.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.virbr0.anycast_delay": "100",
  "net.ipv6.neigh.virbr0.app_solicit": "0",
  "net.ipv6.neigh.virbr0.base_reachable_time": "30",
  "net.ipv6.neigh.virbr0.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.virbr0.delay_first_probe_time": "5",
  "net.ipv6.neigh.virbr0.gc_stale_time": "60",
  "net.ipv6.neigh.virbr0.locktime": "0",
  "net.ipv6.neigh.virbr0.mcast_resolicit": "0",
  "net.ipv6.neigh.virbr0.mcast_solicit": "3",
  "net.ipv6.neigh.virbr0.proxy_delay": "80",
  "net.ipv6.neigh.virbr0.proxy_qlen": "64",
  "net.ipv6.neigh.virbr0.retrans_time": "1000",
  "net.ipv6.neigh.virbr0.retrans_time_ms": "1000",
  "net.ipv6.neigh.virbr0.ucast_solicit": "3",
  "net.ipv6.neigh.virbr0.unres_qlen": "101",
  "net.ipv6.neigh.virbr0.unres_qlen_bytes": "212992",
  "net.ipv6.neigh.wlan0.anycast_delay": "100",
  "net.ipv6.neigh.wlan0.app_solicit": "0",
  "net.ipv6.neigh.wlan0.base_reachable_time": "30",
  "net.ipv6.neigh.wlan0.base_reachable_time_ms": "30000",
  "net.ipv6.neigh.wlan0.delay_first_probe_time": "5",
  "net.ipv6.neigh.wlan0.gc_stale_time": "60",
  "net.ipv6.neigh.wlan0.locktime": "0",
  "net.ipv6.neigh.wlan0.mcast_resolicit": "0",
  "net.ipv6.neigh.wlan0.mcast_solicit": "3",
  "net.ipv6.neigh.wlan0.proxy_delay": "80",
  "net.ipv6.neigh.wlan0.proxy_qlen": "64",
  "net.ipv6.neigh.wlan0.retrans_time": "1000",
  "net.ipv6.neigh.wlan0.retrans_time_ms": "1000",
  "net.ipv6.neigh.wlan0.ucast_solicit": "3",
  "net.ipv6.neigh.wlan0.unres_qlen": "101",
  "net.ipv6.neigh.wlan0.unres_qlen_bytes": "212992",
  "net.ipv6.route.gc_elasticity": "9",
  "net.ipv6.route.gc_interval": "30",
  "net.ipv6.route.gc_min_interval": "0",
  "net.ipv6.route.gc_min_interval_ms": "500",
  "net.ipv6.route.gc_thresh": "1024",
  "net.ipv6.route.gc_timeout": "60",
  "net.ipv6.route.max_size": "4096",
  "net.ipv6.route.min_adv_mss": "1220",
  "net.ipv6.route.mtu_expires": "600",
  "net.ipv6.route.skip_notify_on_dev_down": "0",
  "net.ipv6.seg6_flowlabel": "0",
  "net.ipv6.xfrm6_gc_thresh": "32768",
  "net.netfilter.nf_conntrack_acct": "0",
  "net.netfilter.nf_conntrack_buckets": "65536",
  "net.netfilter.nf_conntrack_checksum": "1",
  "net.netfilter.nf_conntrack_count": "224",
  "net.netfilter.nf_conntrack_dccp_loose": "1",
  "net.netfilter.nf_conntrack_dccp_timeout_closereq": "64",
  "net.netfilter.nf_conntrack_dccp_timeout_closing": "64",
  "net.netfilter.nf_conntrack_dccp_timeout_open": "43200",
  "net.netfilter.nf_conntrack_dccp_timeout_partopen": "480",
  "net.netfilter.nf_conntrack_dccp_timeout_request": "240",
  "net.netfilter.nf_conntrack_dccp_timeout_respond": "480",
  "net.netfilter.nf_conntrack_dccp_timeout_timewait": "240",
  "net.netfilter.nf_conntrack_events": "1",
  "net.netfilter.nf_conntrack_expect_max": "1024",
  "net.netfilter.nf_conntrack_frag6_high_thresh": "4194304",
  "net.netfilter.nf_conntrack_frag6_low_thresh": "3145728",
  "net.netfilter.nf_conntrack_frag6_timeout": "60",
  "net.netfilter.nf_conntrack_generic_timeout": "600",
  "net.netfilter.nf_conntrack_gre_timeout": "30",
  "net.netfilter.nf_conntrack_gre_timeout_stream": "180",
  "net.netfilter.nf_conntrack_helper": "0",
  "net.netfilter.nf_conntrack_icmp_timeout": "30",
  "net.netfilter.nf_conntrack_icmpv6_timeout": "30",
  "net.netfilter.nf_conntrack_log_invalid": "0",
  "net.netfilter.nf_conntrack_max": "262144",
  "net.netfilter.nf_conntrack_sctp_timeout_closed": "10",
  "net.netfilter.nf_conntrack_sctp_timeout_cookie_echoed": "3",
  "net.netfilter.nf_conntrack_sctp_timeout_cookie_wait": "3",
  "net.netfilter.nf_conntrack_sctp_timeout_established": "432000",
  "net.netfilter.nf_conntrack_sctp_timeout_heartbeat_acked": "210",
  "net.netfilter.nf_conntrack_sctp_timeout_heartbeat_sent": "30",
  "net.netfilter.nf_conntrack_sctp_timeout_shutdown_ack_sent": "3",
  "net.netfilter.nf_conntrack_sctp_timeout_shutdown_recd": "0",
  "net.netfilter.nf_conntrack_sctp_timeout_shutdown_sent": "0",
  "net.netfilter.nf_conntrack_tcp_be_liberal": "0",
  "net.netfilter.nf_conntrack_tcp_loose": "1",
  "net.netfilter.nf_conntrack_tcp_max_retrans": "3",
  "net.netfilter.nf_conntrack_tcp_timeout_close": "10",
  "net.netfilter.nf_conntrack_tcp_timeout_close_wait": "60",
  "net.netfilter.nf_conntrack_tcp_timeout_established": "432000",
  "net.netfilter.nf_conntrack_tcp_timeout_fin_wait": "120",
  "net.netfilter.nf_conntrack_tcp_timeout_last_ack": "30",
  "net.netfilter.nf_conntrack_tcp_timeout_max_retrans": "300",
  "net.netfilter.nf_conntrack_tcp_timeout_syn_recv": "60",
  "net.netfilter.nf_conntrack_tcp_timeout_syn_sent": "120",
  "net.netfilter.nf_conntrack_tcp_timeout_time_wait": "120",
  "net.netfilter.nf_conntrack_tcp_timeout_unacknowledged": "300",
  "net.netfilter.nf_conntrack_timestamp": "0",
  "net.netfilter.nf_conntrack_udp_timeout": "30",
  "net.netfilter.nf_conntrack_udp_timeout_stream": "120",
  "net.netfilter.nf_log.0": "NONE",
  "net.netfilter.nf_log.1": "NONE",
  "net.netfilter.nf_log.10": "NONE",
  "net.netfilter.nf_log.11": "NONE",
  "net.netfilter.nf_log.12": "NONE",
  "net.netfilter.nf_log.2": "NONE",
  "net.netfilter.nf_log.3": "NONE",
  "net.netfilter.nf_log.4": "NONE",
  "net.netfilter.nf_log.5": "NONE",
  "net.netfilter.nf_log.6": "NONE",
  "net.netfilter.nf_log.7": "NONE",
  "net.netfilter.nf_log.8": "NONE",
  "net.netfilter.nf_log.9": "NONE",
  "net.netfilter.nf_log_all_netns": "0",
  "net.nf_conntrack_max": "262144",
  "net.unix.max_dgram_qlen": "512",
  "sunrpc.max_resvport": "1023",
  "sunrpc.min_resvport": "665",
  "sunrpc.nfs_debug": "0x0000",
  "sunrpc.nfsd_debug": "0x0000",
  "sunrpc.nlm_debug": "0x0000",
  "sunrpc.rpc_debug": "0x0000",
  "sunrpc.tcp_fin_timeout": "15",
  "sunrpc.tcp_max_slot_table_entries": "65536",
  "sunrpc.tcp_slot_table_entries": "2",
  "sunrpc.transports": "tcp 1048576\nudp 32768",
  "sunrpc.udp_slot_table_entries": "16",
  "user.max_cgroup_namespaces": "127767",
  "user.max_inotify_instances": "128",
  "user.max_inotify_watches": "98304",
  "user.max_ipc_namespaces": "127767",
  "user.max_mnt_namespaces": "127767",
  "user.max_net_namespaces": "127767",
  "user.max_pid_namespaces": "127767",
  "user.max_user_namespaces": "127767",
  "user.max_uts_namespaces": "127767",
  "vm.admin_reserve_kbytes": "8192",
  "vm.block_dump": "0",
  "vm.compact_unevictable_allowed": "1",
  "vm.dirty_background_bytes": "0",
  "vm.dirty_background_ratio": "10",
  "vm.dirty_bytes": "0",
  "vm.dirty_expire_centisecs": "1500",
  "vm.dirty_ratio": "20",
  "vm.dirty_writeback_centisecs": "1500",
  "vm.dirtytime_expire_seconds": "43200",
  "vm.extfrag_threshold": "500",
  "vm.hugetlb_shm_group": "0",
  "vm.laptop_mode": "0",
  "vm.legacy_va_layout": "0",
  "vm.lowmem_reserve_ratio": "256\t256\t32\t0\t0",
  "vm.max_map_count": "65530",
  "vm.memory_failure_early_kill": "0",
  "vm.memory_failure_recovery": "1",
  "vm.min_free_kbytes": "67584",
  "vm.min_slab_ratio": "5",
  "vm.min_unmapped_ratio": "1",
  "vm.mmap_min_addr": "65536",
  "vm.nr_hugepages": "0",
  "vm.nr_hugepages_mempolicy": "0",
  "vm.nr_overcommit_hugepages": "0",
  "vm.numa_stat": "1",
  "vm.numa_zonelist_order": "Node",
  "vm.oom_dump_tasks": "1",
  "vm.oom_kill_allocating_task": "0",
  "vm.overcommit_kbytes": "0",
  "vm.overcommit_memory": "0",
  "vm.overcommit_ratio": "50",
  "vm.page-cluster": "3",
  "vm.panic_on_oom": "0",
  "vm.percpu_pagelist_fraction": "0",
  "vm.stat_interval": "1",
  "vm.swappiness": "60",
  "vm.unprivileged_userfaultfd": "1",
  "vm.user_reserve_kbytes": "131072",
  "vm.vfs_cache_pressure": "100",
  "vm.watermark_boost_factor": "0",
  "vm.watermark_scale_factor": "10",
  "vm.zone_reclaim_mode": "0"
}

bundle agent example_sysctlvalue
{
  vars:
      "kernel_keys_gc_delay"
        string => sysctlvalue("kernel.keys.gc_delay");

  reports:
      "kernel.keys.gc_delay: $(kernel_keys_gc_delay)";
}
bundle agent __main__
{
  methods: "example_sysctlvalue";
}

R: kernel.keys.gc_delay: 300

bundle agent example_readenvfile
{
  vars:
      "_d" data => readenvfile("/etc/os-release");

  reports:
      "$(with)" with => string_mustache( "{{%-top-}}", _d );
}
bundle agent __main__
{
  methods: "example_readenvfile";
}

R: {
  "BUG_REPORT_URL": "https://bugs.launchpad.net/ubuntu/",
  "HOME_URL": "https://www.ubuntu.com/",
  "ID": "ubuntu",
  "ID_LIKE": "debian",
  "NAME": "Ubuntu",
  "PRETTY_NAME": "Ubuntu 20.04.1 LTS",
  "PRIVACY_POLICY_URL": "https://www.ubuntu.com/legal/terms-and-policies/privacy-policy",
  "SUPPORT_URL": "https://help.ubuntu.com/",
  "UBUNTU_CODENAME": "focal",
  "VERSION": "20.04.1 LTS (Focal Fossa)",
  "VERSION_CODENAME": "focal",
  "VERSION_ID": "20.04"
}

In 3.10

Functions

• getuserinfo()
• isipinsubnet()
• variablesmatching_as_data()

bundle agent example_getuserinfo
{
  vars:
      "_user_info" data => getuserinfo("root");
      "_user_info_str" string => format( "%S", _user_info);
  reports:
      "$(_user_info_str)";
}
bundle agent __main__
{
  methods: "example_getuserinfo";
}

R: {"description":"root","gid":0,"home_dir":"/root","shell":"/bin/bash","uid":0,"username":"root"}

bundle agent example_isipinsubnet
{
  classes:
      "192_168_0_1_in_192_168_0_0_24"
        expression => isipinsubnet( "192.168.0.0/24", "192.168.0.1" );
      "192_168_99_1_in_192_168_0_0_24"
        expression => isipinsubnet( "192.168.0.0/24", "192.168.99.1" );

  reports:
    192_168_0_1_in_192_168_0_0_24::
      "192.168.0.1 is in 192.168.0.0/24";
    !192_168_99_1_in_192_168_0_0_24::
      "192.168.99.1 not in 192.168.0.0/24";
}
bundle agent __main__
{
  methods: "example_isipinsubnet";
}

R: 192.168.0.1 is in 192.168.0.0/24
R: 192.168.99.1 not in 192.168.0.0/24

R: {"default:one.the_port":"443","default:two.my_port":"80"}

In 3.9

Functions

• callstack_callers()
• callstack_promisers()
• network_connections()
• findprocesses()
• processexists()
• regex_replace()

bundle agent example_regex_replace
{
  vars:
      "my_string"
        string => "Perl is the best config management tool";
  reports:
      "$(with)" with => regex_replace( $(my_string),
                                        "^\w+", "CFEngine", "" );
}
bundle agent __main__
{
  methods: "example_regex_replace";
}

R: CFEngine is the best config management tool

bundle agent example_processexists
{
  reports:
      "Emacs is running" if => processexists( ".*emacs.*");
      "Emacs is NOT running" unless => processexists( ".*emacs.*");
}
bundle agent __main__
{
  methods: "example_processexists";
}

R: Emacs is running

bundle agent example_findprocesses
{
  vars:
    "_emacs_procs" data => findprocesses( ".*emacs.*" );
    "_i" slist => getindices( _emacs_procs ); 
  reports:
      "Emacs process: $(_emacs_procs[$(_i)][line])";
}
bundle agent __main__
{
  methods: "example_findprocesses";
}

R: Emacs process: nickanderson                   1064467 1064418 1064467  0.0  0.0   5116   0      2644 ?           1 11:45    03:15:18 00:00:00 /home/nickanderson/.emacs.d/elpa/26.3/develop/emacsql-sqlite-20190727.1710/sqlite/emacsql-sqlite /home/nickanderson/.emacs.d/.cache/forge-database.sqlite
R: Emacs process: nickanderson                   1064418    4439    4438 14.3  1.7 987916   0    578144 ?           4 11:45    03:15:45 00:28:10 /usr/bin/emacs26
R: Emacs process: nickanderson                      4593    4355    4355  0.2  1.0 1161376  0    348116 ?           8 Aug10  7-06:34:46 00:22:36 /usr/bin/emacs26 --smid=102752662b823d000159482098500000042660032 --no-splash --chdir=/home/nickanderson

bundle agent example_callstack_promisers
{
  methods:
    "Second promiser"
      usebundle => my_bundle;
}
bundle agent my_bundle
{
  vars:
    "Callers"
      slist => callstack_promisers();

  reports:
    "$(Callers)";
}
bundle agent __main__
{
  methods:
    "First promiser"
      usebundle => example_callstack_promisers;
}

R: First promiser
R: Second promiser

bundle agent example_network_connections
{
  vars:
    "_network_connections"
      data => network_connections();
    "_network_connections_str"
      string => format( "%S", _network_connections ); 
  reports:
    "$(_network_connections[tcp][0][local][address]):$(_network_connections[tcp][0][local][port]) is connected to $(_network_connections[tcp][0][remote][address]):$(_network_connections[tcp][0][remote][port])";
}

bundle agent __main__
{
  methods: "example_network_connections";
}

R: 127.0.0.1:17600 is connected to 0.0.0.0:0

In 3.8

Functions

• url_get()

bundle agent example_url_get
{
  vars:
      "_response"
        data => url_get( "https://jsonplaceholder.typicode.com/todos/1",
                         '{}' );
      # Convert content string to data container
      "_content" data => "$(_response[content])";

      # JSON representation of data container
      "_str_content" string => format( "%S", _content );

  reports:
      "$(_str_content)";
}
bundle agent __main__
{
  methods: "example_url_get";
}

R: {"completed":false,"id":1,"title":"delectus aut autem","userId":1}

Special Topics

Internal agent upgrade mechanism

• Place agent packages in /var/cfengine/master_software_updates/$(sys.flavour)_$(sys.arch)

• Define trigger_upgrade for set of hosts. Ref update_def.cf

  classes:
    "trigger_upgrade" or => { "host1", "host2", "redhat_5" }; 
  

Data transformations

Re-parent a data structure

With mergedata() it is possible to wrap data containers inside of a new JSON data structure in the current namespace.

For example, here we take an array of objects describing content for pghba.conf file and re-parent it under the pghba key in a new data-structure.

bundle agent main
{
    vars:
      "pghba_directives" data => '[
  {
    "type": "host",
    "database": "replication",
    "user": "all",
    "address": "secondary-replication",
    "method": "trust"
  }
]';

      "data" data => mergedata( '{ "pghba": pghba_directives }');


  reports:
      "$(with)" with => string_mustache( "{{%-top-}}", data);

}

R: {
  "pghba": [
    {
      "address": "secondary-replication",
      "database": "replication",
      "method": "trust",
      "type": "host",
      "user": "all"
    }
  ]
}

Merging a result from variablesmatching_as_data()

I see. So, we need to merge the variable values together.

bundle agent main
{
  vars:
      "va_active_opsview_scripts_new"
        data => variablesmatching_as_data(".*", "opsview_rules_scripts");

      "va_active_opsview_scripts_new_index"
        slist => sort( getindices(va_active_opsview_scripts_new), lex);

      # Make a new data container to hold the picked and merged content
      "merged" data => '[]';
      # Merge the existing merged data container with each one of the indices
      "merged" data => mergedata( merged, "va_active_opsview_scripts_new[$(va_active_opsview_scripts_new_index)]" );


  reports:
      "merged: $(with)"
        with => string_mustache( "{{%-top-}}", merged );
      "Rendered to desired format$(const.n)$(with)"
        with => string_mustache( "{{#-top-}}{{name}}={{rule}}$(const.n){{/-top-}}", merged);
}


bundle agent app_opsview_agent
{
  vars:
      "va_opsview_rules_scripts_array_app_opsview_agent_windows"
        meta => { "opsview_rules_scripts" },
        data => '[
    {
      "name": "check_ntp_time",
      "rule": "scripts\\check_windows_time.bat $ARG1$ $ARG2$ $ARG3$",
      "type": "scripts"
    },
    {
      "name": "check_disk",
      "rule": "scripts\\diskspace_nrpe_nt.exe $ARG1$",
      "type": "scripts"
    },
    {
      "name": "check_shadowcopy_status",
      "rule": "cmd /c echo scripts\\check_cdphp_shadowcopy_status.ps1 $ARG1$; exit($LastExitCode) | powershell.exe -command -",
      "type": "scripts"
    }
  ]';

      "va_opsview_rules_scripts_array_app_vars_windows"
        meta => { "opsview_rules_scripts" },
        data => '[
    {
      "name": "check_cory_test",
      "rule": "scripts\\check_cory_test.bat $ARG1$ $ARG2$ $ARG3$",
      "type": "scripts"
    },
    {
      "name": "check_theo_test",
      "rule": "scripts\\check_theo.exe $ARG1$",
      "type": "scripts"
    }
  ]';
}

R: merged: [
  {
    "name": "check_ntp_time",
    "rule": "scripts\\check_windows_time.bat $ARG1$ $ARG2$ $ARG3$",
    "type": "scripts"
  },
  {
    "name": "check_disk",
    "rule": "scripts\\diskspace_nrpe_nt.exe $ARG1$",
    "type": "scripts"
  },
  {
    "name": "check_shadowcopy_status",
    "rule": "cmd /c echo scripts\\check_cdphp_shadowcopy_status.ps1 $ARG1$; exit($LastExitCode) | powershell.exe -command -",
    "type": "scripts"
  },
  {
    "name": "check_cory_test",
    "rule": "scripts\\check_cory_test.bat $ARG1$ $ARG2$ $ARG3$",
    "type": "scripts"
  },
  {
    "name": "check_theo_test",
    "rule": "scripts\\check_theo.exe $ARG1$",
    "type": "scripts"
  }
]
R: Rendered to desired format
check_ntp_time=scripts\check_windows_time.bat $ARG1$ $ARG2$ $ARG3$
check_disk=scripts\diskspace_nrpe_nt.exe $ARG1$
check_shadowcopy_status=cmd /c echo scripts\check_cdphp_shadowcopy_status.ps1 $ARG1$; exit($LastExitCode) | powershell.exe -command -
check_cory_test=scripts\check_cory_test.bat $ARG1$ $ARG2$ $ARG3$
check_theo_test=scripts\check_theo.exe $ARG1$

Inheriting calling bundles classes

bundle agent parent
{
  classes:
      "parent_1" scope => "bundle";

  methods:
      "Inherit context"
        usebundle => child( "First"),
        inherit => "true";

      "No context inheritance"
        usebundle => child( "Second");
}
bundle agent child( id_string )
{
  reports:
    parent_1::
      "$(id_string) see class parent_1 defined";
    !parent_1::
      "$(id_string) see class parent_1 NOT defined";
}
bundle agent __main__ { methods: "parent"; }

R: First see class parent_1 defined
R: Second see class parent_1 NOT defined

Bundles can return data

bundle agent parent
{

  methods:
     "Get data returned by bundle"
        usebundle => my_bundle,
        useresult => "my_returned_vars";


}
bundle agent my_bundle
{
  reports:
      "Hello world" bundle_return_value_index => "msg";
      "Something" bundle_return_value_index => "1";
}
bundle agent __main__ { methods: "parent"; }

Variable name                            Variable value                                               Meta tags                               
default:parent.my_returned_vars[1]       Something                                                    source=bundle                           
default:parent.my_returned_vars[msg]     Hello world                                                  source=bundle                           

Useful Tools and Tips

Syntax Checking

cf-promises --eval-functions=yes --full-check \
  -f ./examples/00-01-hello_world.cf

• Full check requires body common control (or bundle agent main). Typically this is only used when you run cf-promsies against promises.cf, update.cf, or standalone_self_upgrade.cf

cf-promises -f ./examples/00-01-hello_world.cf

Build into your workflow!

• Editors
• vcs hooks
• build systems

noshell vs useshell for commands type promises, execresult(), and returnszero()

• useshell allows you to use pipelines

bundle agent main
{

  vars:
      "result_with_shell"
        string => execresult( "/bin/echo 'Hello$(const.n) World' | grep Hello", useshell);

    reports:
      "$(result_with_shell)";
}

R: Hello

• useshell allows you to redirect output

bundle agent main
{

  classes:

      "successfully_executed"
        expression => returnszero( "/bin/echo 'Hello$(const.n) World' | grep -i world > $(this.promise_filename).out ", useshell);

    reports:
      successfully_executed::
      "Successfully Executed";
      "Grep found: "
        printfile => cat( "$(this.promise_filename).out" );
}

R: Successfully Executed
R: Grep found: 
R:  World

• useshell allows you to use unqualified commands

bundle agent main
{

    vars:

      # Note that echo is not fully qualified. That's because it picked it up
      # from the shells PATH

      "result"
        string => execresult( "echo 'Hello World'", useshell);

    reports:
      "Result: $(result)";
}

R: Result: Hello World

cf-remote

• https://cfengine.com/company/blog-detail/cf-remote/
• https://github.com/cfengine/core/tree/master/contrib/cf-remote

cf-remote install --hub 34.252.28.73 --bootstrap 172.31.30.237

cf-locate

cf-locate

Command line tool to help locate and optionally display a body or bundle within a policy

Debug Reports

Use standardized DEBUG reports for policy development and troubleshooting.

bundle agent main
{
  reports:
    DEBUG|DEBUG_this_bundle_name::
      "DEBUG $(this.bundle): ....";
    "DEBUG|DEBUG_$(this.bundle)"::
      "DEBUG $(this.bundle): ....";
 }

Promise comments

Use promise comments to document WHY the promise is important.

bundle agent main
{
  services:
    "firewalld"
      policy => "start",
      comment => "If this service isnt running, then we have unnecessary
                  exposure and increase our risk of a security breach.";
}

Getting the most from the documentation

jq

echo '{
  "data": [
    {
      "firstseen": "1578745699",
      "hostname": "host001.example.com",
      "id": "SHA=e01f65d069b9035c280ea0bdba6cf6e47863ac074a170addbad26e98cc89925c",
      "ip": "192.0.2.2",
      "lastreport": "1582643957"
    },
    {
      "firstseen": "1578745692",
      "hostname": "hub.example.com",
      "id": "SHA=70138d580b9fd292ff856746df2fe7f9ded29db9ffca0c4d83acbbb97cde4d42",
      "ip": "192.0.2.1",
      "lastreport": "1582643974"
    }
  ],
  "meta": {
    "count": 2,
    "page": 1,
    "timestamp": 1582644064,
    "total": 7
  }
}'

{
  "data": [
    {
      "firstseen": "1578745699",
      "hostname": "host001.example.com",
      "id": "SHA=e01f65d069b9035c280ea0bdba6cf6e47863ac074a170addbad26e98cc89925c",
      "ip": "192.0.2.1",
      "lastreport": "1582643957"
    },
    {
      "firstseen": "1578745692",
      "hostname": "hub.example.com",
      "id": "SHA=70138d580b9fd292ff856746df2fe7f9ded29db9ffca0c4d83acbbb97cde4d42",
      "ip": "104.236.18.209",
      "lastreport": "1582643974"
    }
  ],
  "meta": {
    "count": 2,
    "page": 1,
    "timestamp": 1582644064,
    "total": 7
  }
}

cf-runagent

cf-runagent --background=3 --remote-bundles satellite_registration \
  -H $(curl -s -k --user $USER:$PASSWORD \
  https://$HUB/api/host\?count\=2\&context-include\=not_rh_satellite_registered |\
  jq '.data | map(.ip) | join(",")'|tr -d '"')

Additional Resources

Learning CFEngine

Widely considered best book to get a good grounding in CFEngine.

CFEngine Tutorial

Training material published by Aleksey Tsalolikhin from Vertical Sysadmin, one of our partners.

VSA Training Material

Self paced in depth tutorial based on Vertical Sysadmin training coursework

Example Policy Layout

An example policy layout

CFEngine Spacemacs Layer

The best editor is neither Emacs nor Vim, it's Emacs and Vim!

cf-locate

Find and optionally display body and bundle definitions within a policy set

Policy Style Guide

Write policy in a common style. Make it easier for others to quickly digest your policy.

cf-keycrypt

Tool to encrypt data with CFEngine public keys (in core as of 3.16.0)

• Allows to encrypt data for individual hosts using the public key
• Can be used with non host keys for "group" encryption

cf-profile

Displays execution time summary for cf-agent run to find time consuming polices

vim_cf3

CFEngine 3 vim plugin with Syntax highlighting

reindent.pl

Re-indent CFEngine policy using this script that leverages the excellent cfengine3 mode in Emacs

Sublime Text 3 CFEngine Beautifier

Automatically reformat CFEngine policy in Sublime Text

Sublime Text 3 Syntax Highlighter & Snippets

CFEngine Syntax highlighting and snippets for Sublime Text

cfe-rsplaytime

Compute splaytime for a given host

cfe-profiler

Measures bundle execution time helping to uncover the most time consuming bundles

Editor support for CFEngine

A list of editors with references for making working with cfengine syntax easier

CFEngine in a Day

Old, but still good 4 part video series ~ 5 hours of Mark Burgess (original author and founder) giving a one day training at SurfSara

CFEngine Tutorial

Training material published by Aleksey Tsalolikhin from Vertical Sysadmin, one of our partners.

General FAQs

Frequently asked questions

Hub Admin FAQ

Frequently asked questions about CFEngine Enterprise Hub administration

Git Primer

Git

Git is the most popular modern version control management tool. Github, Bitbucket, and GitLab all provide great hosted and on prem repository management solutions.

Using a git management system is reccomended for implementing access controls and improved collaboration with regard to policy and systems management.

Getting started

Log into the policy server

[user@workstation] $ vagrant ssh hub
[vagrant@hub] $ sudo -i

Configure git author

[root@hub masterfiles] # git config -–global user.name “Mr. Slate”
[root@hub masterfiles] # git config -–global user.email “bossman@slateco.com”
[root@hub masterfiles] # git config --global push.default simple

Clone builtin repository

[root@hub masterfiles] # git clone /opt/cfengine/masterfiles.git /vagrant/masterfiles
Cloning into '/vagrant/masterfiles'...

Add a file to the repository

[root@hub masterfiles] # cd /vagrant/masterfiles
[root@hub masterfiles] # ls
cfe_internal  Changelog  controls  def.cf  lessons  lib  libraries  promises.cf  services  sketches  update  update.cf
[root@hub masterfiles] # echo hi > file
[root@hub masterfiles] # git status
# On branch master
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	file
nothing added to commit but untracked files present (use "git add" to track)

Stage and commit the changes

[root@hub masterfiles] # git add file
[root@hub masterfiles] # git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	new file:   file
#
# git commit -m “Testing git workflow”
[master c886caf] Testing git workflow
 0 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 file

Publish the change

[root@hub masterfiles] # git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
nothing to commit (working directory clean)
[root@hub masterfiles] # git push
Counting objects: 4, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 280 bytes, done.
Total 3 (delta 1), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
To /opt/cfengine/masterfiles.git
   ee31801..94b8151  master -> master
# git status
# On branch master
nothing to commit (working directory clean)

Modify a file

[root@hub masterfiles] # echo HI >> file
[root@hub masterfiles] # git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
# Changed but not updated:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   file
#
no changes added to commit (use "git add" and/or "git commit -a")

Diff to validate detail of content change

[root@hub masterfiles] # git diff
diff --git a/file b/file
index 45b983b..313352b 100644
--- a/file
+++ b/file
@@ -1 +1,2 @@
 hi
+HI

Stage and commit the changes

[root@hub masterfiles] # git add file
[root@hub masterfiles] # git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   file
#
# git commit -m "Modified file"
[master fd94885] Modified file
 1 files changed, 1 insertions(+), 0 deletions(-)
# git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commits.
#
nothing to commit (working directory clean)

Publish the change

[root@hub masterfiles] # git push
Counting objects: 7, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (5/5), 493 bytes, done.
Total 5 (delta 2), reused 0 (delta 0)
Unpacking objects: 100% (5/5), done.
To /opt/cfengine/masterfiles.git
   c886caf..fd94885  master -> master

Remove a file

[root@hub masterfiles] # git rm file
# rm 'file'
[root@hub masterfiles] # git status
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	deleted:    file
#
# git commit -m "Remove file"
[master 4c9d46d] Remove file
 1 files changed, 0 insertions(+), 3 deletions(-)
 delete mode 100644 file

Publish the change

[root@hub masterfiles] # git push
Counting objects: 3, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 230 bytes, done.
Total 2 (delta 1), reused 0 (delta 0)
Unpacking objects: 100% (2/2), done.
To /opt/cfengine/masterfiles.git
   92660a9..4c9d46d  master -> master

Place masterfiles into the repository

[root@hub masterfiles] # rsync -avz /var/cfengine/masterfiles/ .
[root@hub masterfiles] # git add -A
[root@hub masterfiles] # git commit -m "Seed repository with masterfiles"
[root@hub masterfiles] # git push

Configure masterfiles for git integration

[root@hub masterfiles]# echo '{ "classes": { "cfengine_internal_masterfiles_update": [ "policy_server" ] } }' > def.json
[root@hub masterfiles]# git add def.json
[root@hub masterfiles]# git commit -m "Enable automatic masterfiles update from repository"
[master c206654] Enable automatic masterfiles update from repository
 1 file changed, 1 insertion(+)
 create mode 100644 def.json
[root@hub masterfiles]# git push
warning: push.default is unset; its implicit value is changing in
Git 2.0 from 'matching' to 'simple'. To squelch this message
and maintain the current behavior after the default changes, use:

  git config --global push.default matching

To squelch this message and adopt the new behavior now, use:

  git config --global push.default simple

See 'git help config' and search for 'push.default' for further information.
(the 'simple' mode was introduced in Git 1.7.11. Use the similar mode
'current' instead of 'simple' if you sometimes use older versions of Git)

Counting objects: 4, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 370 bytes | 0 bytes/s, done.
Total 3 (delta 1), reused 0 (delta 0)
To /opt/cfengine/masterfiles.git
   a181449..c206654  master -> master

Activate current update policy with enablement class

[root@hub masterfiles]# cf-agent --no-lock \
--verbose \
--define cfengine_internal_masterfiles_update \
--file update.cf

Verify presence of def.json

[root@hub masterfiles]# cat /var/cfengine/masterfiles/def.json

Review

Now when the agent runs on hosts that define policy_server policy will be activated that keeps /var/cfengine/masterfiles up to date with whats in the repository as configured in mission portal (which by default is /opt/cfengine/masterfiles.git).

This means new policy will be distributed as you push it into the repository. Continuous delivery FTW!

Git command reference

Pop Quiz

• Who was Mr. Slate?

• How do you get an overview of the changes to your clone?

• How can you easily search a git repository?

Wrapping up

Please take a few moments to fill out this survey about your experience: https://www.surveymonkey.com/r/CFEngine-Training